我已做的工作：
1、把主板取出，用酒精擦了一次，显卡等硬件重新插过。
2、光驱、软驱（A盘）的数据线全部取下。

依然时时会发生重启现像，主要表现：
1、打开网络不久或玩游戏一阵子即出现重启现像。
2、重启后，进入系统不正常，显卡变成860*480（4色），重装驱动无效。和进入安全模式一样的。
3、网络连结不上。
4、有时重启过几次后，会自动断电，CPU停止转动，但奇怪的是，电脑插上的U盘有电源显示。必须要取下电脑电源线后，再重新插上电源后，CPU才能重新开始运作。

本次，我是还原系统才正常进入了电脑。（我电脑是D盘关了还原，C盘没关，文件系统是NTFS）。

附日志如下，请高手帮忙，谢谢！

Logfile of HijackThis v1.99.1
Scan saved at 18:01:52, on 2006-9-10
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\Explorer.EXE
C:\KAV2006\KWatch.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\KAV2006\KAVStart.exe
C:\WINDOWS\system32\ctfmon.exe
C:\KAV2006\KPFW32.EXE
C:\KAV2006\KMailMon.EXE
C:\KAV2006\KPfwSvc.EXE
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\NOTEPAD.EXE
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\ChinaNet\VnetClient.exe
C:\Program Files\Thunder Network\WebThunder\WebThunder.exe
C:\Documents and Settings\zl\桌面\HijackThis.exe
C:\WINDOWS\system32\wuauclt.exe

O1 - Hosts: 1127.0.0.1 www.82344.com
O1 - Hosts: 2127.0.0.1 ete.cn/opengo.php
O2 - BHO: WebThunderBHO - {00000AAA-A363-466E-BEF5-9BB68697AA7F} - C:\Program Files\Thunder Network\WebThunder\WebThunderBHO_013.dll
O2 - BHO: VnetCookie Class - {4E83D567-4697-4F7B-B1F0-A513B01DB89A} - c:\PROGRA~1\chinanet\VNETTR~1.DLL
O2 - BHO: QQIEHelper - {54EBD53A-9BC1-480B-966A-843A333CA162} - C:\Program Files\Tencent\QQ\QQIEHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O3 - Toolbar: BitComet工具栏 - {3F1ABCDB-A875-46c1-8345-B72A4567E486} - C:\Program Files\BitComet\BitCometBar\BitCometBar0.6.dll
O4 - HKLM\..\Run: [KavStart] "C:\KAV2006\KAVStart.exe" -startup
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [KavPFW] "C:\KAV2006\KPFW32.EXE"
O8 - Extra context menu item: Google 搜索(&G) - res://C:\Program Files\Google\GoogleToolbar1.dll/cmsearch.html
O8 - Extra context menu item: 上传到QQ网络硬盘 - C:\Program Files\Tencent\QQ\AddToNetDisk.htm
O8 - Extra context menu item: 使用Web迅雷下载 - C:\Program Files\Thunder Network\WebThunder\GetUrl.htm
O8 - Extra context menu item: 使用Web迅雷下载全部链接 - C:\Program Files\Thunder Network\WebThunder\GetAllUrl.htm
O8 - Extra context menu item: 反向链接 - res://C:\Program Files\Google\GoogleToolbar1.dll/cmbacklinks.html
O8 - Extra context menu item: 添加到QQ自定义面板 - C:\Program Files\Tencent\QQ\AddPanel.htm
O8 - Extra context menu item: 添加到QQ表情 - C:\Program Files\Tencent\QQ\AddEmotion.htm
O8 - Extra context menu item: 用QQ彩信发送该图片 - C:\Program Files\Tencent\QQ\SendMMS.htm
O8 - Extra context menu item: 类似网页 - res://C:\Program Files\Google\GoogleToolbar1.dll/cmsimilar.html
O8 - Extra context menu item: 缓存的网页快照 - res://C:\Program Files\Google\GoogleToolbar1.dll/cmcache.html
O8 - Extra context menu item: 翻译英文字词(&T) - res://C:\Program Files\Google\GoogleToolbar1.dll/cmwordtrans.html
O9 - Extra button: 启动Web迅雷 - {962EFB8E-2683-42d4-AC74-AAA4C759B9C6} - http://my.xunlei.com (file missing)
O9 - Extra 'Tools' menuitem: 启动Web迅雷 - {962EFB8E-2683-42d4-AC74-AAA4C759B9C6} - http://my.xunlei.com (file missing)
O9 - Extra button: QQ - {c95fe080-8f5d-11d2-a20b-00aa003c157b} - C:\Program Files\Tencent\QQ\QQ.EXE
O9 - Extra 'Tools' menuitem: QQ - {c95fe080-8f5d-11d2-a20b-00aa003c157b} - C:\Program Files\Tencent\QQ\QQ.EXE
O9 - Extra button: QQ炫彩工具条设置 - {DEDEB80D-FA35-45d9-9460-4983E5A8AFE6} - C:\Program Files\Tencent\QQ\QQIEHelper.dll
O9 - Extra 'Tools' menuitem: QQ炫彩工具条设置 - {DEDEB80D-FA35-45d9-9460-4983E5A8AFE6} - C:\Program Files\Tencent\QQ\QQIEHelper.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O17 - HKLM\System\CCS\Services\Tcpip\..\{C0A72C47-C9DF-4957-A29F-FF170CD218F7}: NameServer = 202.96.128.166 202.96.134.133
O23 - Service: Kingsoft Personal Firewall Service (KPfwSvc) - Kingsoft Corporation - C:\KAV2006\KPfwSvc.EXE
O23 - Service: Kingsoft Antivirus KWatch Service (KWatchSvc) - Kingsoft Corporation - C:\KAV2006\KWatch.EXE
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe

2006-09-10,17:27:44

System Repair Engineer 2.0.21.505 (2.0 RC 2)
Smallfrogs (http://www.KZTechs.com)

Windows XP Professional Service Pack 2 (Build 2600)
- 管理权限用户 - 完整功能

以下内容被选中：
    所有的启动项目（包括注册表、启动文件夹、服务等）
    浏览器加载项
    正在运行的进程（包括进程模块信息）
    文件关联


启动项目
注册表
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
    <ctfmon.exe><C:\WINDOWS\system32\ctfmon.exe>  [Microsoft Corporation]
    <KavPFW><"C:\KAV2006\KPFW32.EXE">  [Kingsoft Corporation]
[HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows]
    <load><>  []
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run]
    <KavStart><"C:\KAV2006\KAVStart.exe" -startup>  [Kingsoft Corporation]
    <NvCplDaemon><; RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup>  [NVIDIA Corporation]
    <nwiz><; nwiz.exe /install>  []
    <NvMediaCenter><; RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit>  [NVIDIA Corporation]
    <KAVUpdate><; C:\KAV2006\Update.exe /Slience>  [Kingsoft Corporation]
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
    <shell><Explorer.exe>  [Microsoft Corporation]
    <Userinit><C:\WINDOWS\system32\userinit.exe,>  [Microsoft Corporation]
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Windows]
    <AppInit_DLLs><>  []
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
    <UIHost><logonui.exe>  [Microsoft Corporation]

==================================
启动文件夹
服务
[Kingsoft Personal Firewall Service / KPfwSvc]
  <"C:\KAV2006\KPfwSvc.EXE"><Kingsoft Corporation>
[Kingsoft Antivirus KWatch Service / KWatchSvc]
  <C:\KAV2006\KWatch.EXE><Kingsoft Corporation>
[NVIDIA Display Driver Service / NVSvc]
  <C:\WINDOWS\system32\nvsvc32.exe><NVIDIA Corporation>

==================================
浏览器加载项
[WebThunder Browser Helper]
  {00000AAA-A363-466E-BEF5-9BB68697AA7F} <C:\Program Files\Thunder Network\WebThunder\WebThunderBHO_013.dll, Thunder Networking Technologies,LTD>
[VnetCookie Class]
  {4E83D567-4697-4F7B-B1F0-A513B01DB89A} <c:\PROGRA~1\chinanet\VNETTR~1.DLL, >
[QQBrowserHelperObject Class]
  {54EBD53A-9BC1-480B-966A-843A333CA162} <C:\Program Files\Tencent\QQ\QQIEHelper.dll, 深圳市腾讯计算机系统有限公司>
[Google Toolbar Helper]
  {AA58ED58-01DD-4d91-8333-CF10577473F7} <c:\program files\google\googletoolbar1.dll, Google Inc.>
[启动Web迅雷]
  {962EFB8E-2683-42d4-AC74-AAA4C759B9C6} <http://my.xunlei.com, N/A>
[QQ]
  {c95fe080-8f5d-11d2-a20b-00aa003c157b} <C:\Program Files\Tencent\QQ\QQ.EXE, TENCENT>
[QQIEFloatBarCfgCmd Class]
  {DEDEB80D-FA35-45d9-9460-4983E5A8AFE6} <C:\Program Files\Tencent\QQ\QQIEHelper.dll, 深圳市腾讯计算机系统有限公司>
[Messenger]
  {FB5F1910-F110-11d2-BB9E-00C04F795683} <C:\Program Files\Messenger\msmsgs.exe, Microsoft Corporation>
[&Google]
  {2318C2B1-4965-11d4-9B18-009027A5CD4F} <c:\program files\google\googletoolbar1.dll, Google Inc.>
[BitComet工具栏]
  {3F1ABCDB-A875-46c1-8345-B72A4567E486} <C:\Program Files\BitComet\BitCometBar\BitCometBar0.6.dll, N/A>
[Shockwave Flash Object]
  {D27CDB6E-AE6D-11CF-96B8-444553540000} <C:\WINDOWS\system32\Macromed\Flash\Flash9.ocx, Adobe Systems, Inc.>
[WebThunder Browser Helper]
  {00000AAA-A363-466E-BEF5-9BB68697AA7F} <C:\Program Files\Thunder Network\WebThunder\WebThunderBHO_013.dll, Thunder Networking Technologies,LTD>
[&Google]
  {2318C2B1-4965-11D4-9B18-009027A5CD4F} <c:\program files\google\googletoolbar1.dll, Google Inc.>
[BitComet工具栏]
  {3F1ABCDB-A875-46C1-8345-B72A4567E486} <C:\Program Files\BitComet\BitCometBar\BitCometBar0.6.dll, N/A>
[VnetCookie Class]
  {4E83D567-4697-4F7B-B1F0-A513B01DB89A} <c:\PROGRA~1\chinanet\VNETTR~1.DLL, >
[QQBrowserHelperObject Class]
  {54EBD53A-9BC1-480B-966A-843A333CA162} <C:\Program Files\Tencent\QQ\QQIEHelper.dll, 深圳市腾讯计算机系统有限公司>
[Windows Media Player]
  {6BF52A52-394A-11D3-B153-00C04F79FAA6} <C:\WINDOWS\system32\wmp.dll, Microsoft Corporation>
[MediaComm Class]
  {7670648D-461B-42AF-BDFE-46D26AF5EFF2} <C:\Program Files\Thunder Network\WebThunder\MediaAddin06.dll, Thunder Networking Technologies,LTD>
[Google Toolbar Helper]
  {AA58ED58-01DD-4D91-8333-CF10577473F7} <c:\program files\google\googletoolbar1.dll, Google Inc.>
[Microsoft Scriptlet Component]
  {AE24FDAE-03C6-11D1-8B76-0080C744F389} <C:\WINDOWS\system32\mshtml.dll, Microsoft Corporation>
[SearchAssistantOC]
  {B45FF030-4447-11D2-85DE-00C04FA35C89} <%SystemRoot%\system32\shdocvw.dll, N/A>
[Shockwave Flash Object]
  {D27CDB6E-AE6D-11CF-96B8-444553540000} <C:\WINDOWS\system32\Macromed\Flash\Flash9.ocx, Adobe Systems, Inc.>
[Google 搜索(&G)]
  <res://C:\Program Files\Google\GoogleToolbar1.dll/cmsearch.html, N/A>
[上传到QQ网络硬盘]
  <C:\Program Files\Tencent\QQ\AddToNetDisk.htm, N/A>
[使用Web迅雷下载]
  <C:\Program Files\Thunder Network\WebThunder\GetUrl.htm, N/A>
[使用Web迅雷下载全部链接]
  <C:\Program Files\Thunder Network\WebThunder\GetAllUrl.htm, N/A>
[反向链接]
  <res://C:\Program Files\Google\GoogleToolbar1.dll/cmbacklinks.html, N/A>
[添加到QQ自定义面板]
  <C:\Program Files\Tencent\QQ\AddPanel.htm, N/A>
[添加到QQ表情]
  <C:\Program Files\Tencent\QQ\AddEmotion.htm, N/A>
[用QQ彩信发送该图片]
  <C:\Program Files\Tencent\QQ\SendMMS.htm, N/A>
[类似网页]
  <res://C:\Program Files\Google\GoogleToolbar1.dll/cmsimilar.html, N/A>
[缓存的网页快照]
  <res://C:\Program Files\Google\GoogleToolbar1.dll/cmcache.html, N/A>
[翻译英文字词(&T)]
  <res://C:\Program Files\Google\GoogleToolbar1.dll/cmwordtrans.html, N/A>

==================================
正在运行的进程
[PID: 428][\SystemRoot\System32\smss.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 484][\??\C:\WINDOWS\system32\csrss.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 512][\??\C:\WINDOWS\system32\winlogon.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 556][C:\WINDOWS\system32\services.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 568][C:\WINDOWS\system32\lsass.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 720][C:\WINDOWS\system32\svchost.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 776][C:\WINDOWS\system32\svchost.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 840][C:\WINDOWS\System32\svchost.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 888][C:\WINDOWS\system32\svchost.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 940][C:\WINDOWS\system32\svchost.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
[PID: 1208][C:\WINDOWS\Explorer.EXE]  <Microsoft Corporation><6.00.2900.2180 (xpsp_sp2_rtm.040803-2158)>
    [C:\KAV2006\KASocket.dll]  <Kingsoft Corporation><2005, 2, 22, 233>
    [C:\KAV2006\KMailOEBand.dll]  <N/A><2006, 5, 19, 118>
    [C:\Program Files\Thunder Network\WebThunder\WebThunderBHO_013.dll]  <Thunder Networking Technologies,LTD><6, 0, 0, 4>
[PID: 1240][C:\KAV2006\KWatch.EXE]  <Kingsoft Corporation><2005, 9, 27, 51>
    [C:\KAV2006\KAVIPC2.DLL]  <Kingsoft Corporation><2004, 12, 28, 20>
    [C:\KAV2006\KAEPlat.DLL]  <Kingsoft Corp.><2006, 5, 30, 59>
    [C:\KAV2006\KAEMem.DAT]  <Kingsoft><2006, 5, 17, 14>
    [C:\KAV2006\KAEUnpack.DAT]  <Kingsoft Corp.><2006, 7, 27, 59>
[PID: 1296][C:\WINDOWS\system32\spoolsv.exe]  <Microsoft Corporation><5.1.2600.2696 (xpsp_sp2_gdr.050610-1519)>
[PID: 1476][C:\KAV2006\KAVStart.exe]  <Kingsoft Corporation><2006, 8, 28, 204>
    [C:\KAV2006\KAVIPC2.DLL]  <Kingsoft Corporation><2004, 12, 28, 20>
    [C:\KAV2006\KAVPassp.dll]  <Kingsoft Corporation><2006, 6, 7, 252>
    [C:\KAV2006\PopSprt3.dll]  <Kingsoft Corporation><2006, 8, 14, 35>
    [C:\KAV2006\KASocket.dll]  <Kingsoft Corporation><2005, 2, 22, 233>
[PID: 1496][C:\WINDOWS\system32\ctfmon.exe]  <Microsoft Corporation><5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)>
    [C:\KAV2006\KASocket.dll]  <Kingsoft Corporation><2005, 2, 22, 233>
[PID: 1520][C:\KAV2006\KPFW32.EXE]  <Kingsoft Corporation><2006, 8, 9, 615>
    [C:\KAV2006\KMailOEBand.dll]  <N/A><2006, 5, 19, 118>
    [C:\KAV2006\KASocket.dll]  <Kingsoft Corporation><2005, 2, 22, 233>
    [C:\KAV2006\KAVIPC2.DLL]  <Kingsoft Corporation><2004, 12, 28, 20>
    [C:\KAV2006\KAConfig.DLL]  <Kingsoft Corporation><2005, 3, 23, 30>
    [C:\KAV2006\FiltList.dll]  <N/A><N/A>
    [C:\KAV2006\KAVPassp.DLL]  <Kingsoft Corporation><2006, 6, 7, 252>
    [C:\KAV2006\KAEPlat.DLL]  <Kingsoft Corp.><2006, 5, 30, 59>
    [C:\KAV2006\KAEMem.DAT]  <Kingsoft><2006, 5, 17, 14>
    [C:\KAV2006\KAEUnpack.DAT]  <Kingsoft Corp.><2006, 7, 27, 59>
[PID: 1540][C:\KAV2006\KMailMon.EXE]  <Kingsoft Corporation><2006, 4, 12, 106>
    [C:\KAV2006\KAntiSpm.dll]  <N/A><1, 0, 0, 2>
    [C:\KAV2006\KAVIPC2.DLL]  <Kingsoft Corporation><2004, 12, 28, 20>
    [C:\KAV2006\KAECall2.DLL]  <Kingsoft Corporation><2004, 12, 28, 7>
    [C:\KAV2006\KAEPlat.DLL]  <Kingsoft Corp.><2006, 5, 30, 59>
    [C:\KAV2006\KAEMem.DAT]  <Kingsoft><2006, 5, 17, 14>
    [C:\KAV2006\KAEUnpack.DAT]  <Kingsoft Corp.><2006, 7, 27, 59>
    [C:\KAV2006\KAConfig.DLL]  <Kingsoft Corporation><2005, 3, 23, 30>
    [C:\KAV2006\KASocket.dll]  <Kingsoft Corporation><2005, 2, 22, 233>
    [C:\KAV2006\KMailOEBand.dll]  <N/A><2006, 5, 19, 118>
[PID: 1596][C:\KAV2006\KPfwSvc.EXE]  <Kingsoft Corporation><2005, 9, 5, 28>
[PID: 1928][F:\SREng2\SREng.exe]  <Smallfrogs Studio><2.0.21.505>
    [C:\KAV2006\KMailOEBand.dll]  <N/A><2006, 5, 19, 118>
    [C:\KAV2006\KASocket.dll]  <Kingsoft Corporation><2005, 2, 22, 233>

==================================
文件关联
.TXT  OK. [%SystemRoot%\system32\NOTEPAD.EXE %1]
.EXE  OK. ["%1" %*]
.COM  OK. ["%1" %*]
.PIF  OK. ["%1" %*]
.REG  OK. [regedit.exe "%1"]
.BAT  OK. ["%1" %*]
.SCR  OK. ["%1" /S]
.CHM  OK. ["C:\WINDOWS\hh.exe" %1]
.HLP  OK. [%SystemRoot%\system32\winhlp32.exe %1]
.INI  OK. [%SystemRoot%\System32\NOTEPAD.EXE %1]
.INF  OK. [%SystemRoot%\System32\NOTEPAD.EXE %1]
.VBS  OK. [%SystemRoot%\System32\WScript.exe "%1" %*]
.JS  OK. [%SystemRoot%\System32\WScript.exe "%1" %*]
.LNK  OK. [{00021401-0000-0000-C000-000000000046}]

==================================
Winsock 提供者

==================================

楼主有没有试过把电源换一下，

电源倒是没换过。我用的是清华同创电源。

请帮忙瞧瞧日志有没问题，谢谢！