刚才杀毒杀了13个，但是总感觉机子运行的很不好，麻烦看看，谢谢！
Logfile of HijackThis v1.99.1
Scan saved at 19:43:59, on 2005-09-02
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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:\WINDOWS\system32\rundll32.exe
C:\Program Files\Common Files\Real\Update_OB\realsched.exe
C:\WINDOWS\System32\ctfmon.exe
C:\KV2004\KVSrvXP.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\msdos.pif
C:\WINDOWS\System32\msdos.pif
C:\Documents and Settings\Rainb0w\桌面\HijackThis.exe

R3 - URLSearchHook: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRA~1\3721\Assist\asbar.dll
O2 - BHO: QQIEHelper - {54EBD53A-9BC1-480B-966A-843A333CA162} - C:\Program Files\Tencent\QQ\QQIEHelper.dll
O2 - BHO: BrowseHelper Class - {80BF4637-D65B-43F3-BB60-C5DD3D5FB7B9} - C:\KV2004\KvShell.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O2 - BHO: AssistII - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRA~1\3721\Assist\asbar.dll
O2 - BHO: IE - {D157330A-9EF3-49F8-9A67-4141AC41ADD4} - C:\WINDOWS\DOWNLO~1\CnsHook.dll
O3 - Toolbar: 电台(&R) - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: 江民杀毒工具栏 - {B5A34A93-D538-43A7-8371-864CB6148D12} - C:\KV2004\KvShell.dll
O3 - Toolbar: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRA~1\3721\Assist\asbar.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [IMSCMig] C:\PROGRA~1\COMMON~1\MICROS~1\IME\IMSC40A\IMSCMIG.EXE /Preload
O4 - HKLM\..\Run: [IMJPMIG8.1] "C:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE" /Spoil /RemAdvDef /Migration32
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [PHIME2002ASync] C:\WINDOWS\System32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - HKLM\..\Run: [PHIME2002A] C:\WINDOWS\System32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [KvMonXP] C:\KV2004\KVMonXP.kxp /auto
O4 - HKLM\..\Run: [helper.dll] C:\WINDOWS\system32\rundll32.exe C:\PROGRA~1\3721\helper.dll,Rundll32
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Common Files\Real\Update_OB\realsched.exe"  -osboot
O4 - HKLM\..\Run: [MSDOS Security Service] msdos.pif
O4 - HKLM\..\Run: [Intec Service Drivers] msmsgr.exe
O4 - HKLM\..\RunServices: [MSDOS Security Service] msdos.pif
O4 - HKLM\..\RunServices: [Intec Service Drivers] msmsgr.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [Intec Service Drivers] msmsgr.exe
O4 - HKCU\..\Run: [MSDOS Security Service] msdos.pif
O4 - HKCU\..\RunServices: [Intec Service Drivers] msmsgr.exe
O4 - HKCU\..\RunServices: [MSDOS Security Service] msdos.pif
O4 - Startup: 腾讯QQ.lnk = C:\Program Files\Tencent\QQ\QQ.exe
O8 - Extra context menu item: !搜一搜 - res://C:\WINDOWS\DOWNLO~1\CnsMinEx.dll/1003
O8 - Extra context menu item: &Google Search - res://C:\Program Files\Google\GoogleToolbar1.dll/cmsearch.html
O8 - Extra context menu item: Backward &Links - res://C:\Program Files\Google\GoogleToolbar1.dll/cmbacklinks.html
O8 - Extra context menu item: Cac&hed Snapshot of Page - res://C:\Program Files\Google\GoogleToolbar1.dll/cmcache.html
O8 - Extra context menu item: Si&milar Pages - res://C:\Program Files\Google\GoogleToolbar1.dll/cmsimilar.html
O8 - Extra context menu item: Translate into English - res://C:\Program Files\Google\GoogleToolbar1.dll/cmtrans.html
O8 - Extra context menu item: 导出到 Microsoft Office Excel(&X) - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
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
O9 - Extra button: 手机短信 - {00000000-0000-0001-0001-596BAEDD1289} - http://sms.3721.com/ie/index.htm (file missing)
O9 - Extra button: 浩方对战平台 - {0A155D3C-68E2-4215-A47A-E800A446447A} - F:\备份\HFGame3\GameClient.exe
O9 - Extra button: Yahoo 1G电邮 - {507F9113-CD77-4866-BA92-0E86DA3D0B97} - http://cn.mail.yahoo.com/promo/rd1 (file missing)
O9 - Extra button: 寻宝乐趣多 - {59BC54A2-56B3-44a0-93E5-432D58746E26} - http://hot.3721.com/rd/shop_btn.htm (file missing)
O9 - Extra button: 上网助手 - {5D73EE86-05F1-49ed-B850-E423120EC338} - http://assistant.3721.com/index.htm?fb=Cns (file missing)
O9 - Extra button: 情景聊天 - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - http://cn.rd.yahoo.com/home/messenger/bjk/clientbtn/?http://cn.messenger.yahoo.com/ (file missing)
O9 - Extra button: (no name) - {ECF2E268-F28C-48d2-9AB7-8F69C11CCB71} - http://assistant.3721.com/security1.htm?fb=Cns (file missing)
O9 - Extra 'Tools' menuitem: 修复浏览器 - {ECF2E268-F28C-48d2-9AB7-8F69C11CCB71} - http://assistant.3721.com/security1.htm?fb=Cns (file missing)
O9 - Extra button: (no name) - {FD00D911-7529-4084-9946-A29F1BDF4FE5} - http://assistant.3721.com/clean1.htm?fb=Cns (file missing)
O9 - Extra 'Tools' menuitem: 清理上网记录 - {FD00D911-7529-4084-9946-A29F1BDF4FE5} - http://assistant.3721.com/clean1.htm?fb=Cns (file missing)
O11 - Options group: [!CNS]  网络实名
O16 - DPF: {C8BD9ACB-F7EC-48E6-BB2F-DAADC6789E9A} (Kingsoft DUBA OnlineScan) - http://211.152.52.102/duba/antiscan/update/OCX/KAVClean.CAB
O23 - Service: KVSrvXP - JiangMin Ltd. - C:\KV2004\KVSrvXP.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe

重新启动到安全模式（进入安全模式的方法:重新启动电脑, 开机自动检测完后, 按[F8]键(可以一直按到启动菜单出来为止), 选择安全模式(Safe Mode)进入Windows。）

先终止下面的进程（关闭所有窗口，同时按下CTRL+ALT+DELETE，在打开的窗口中选中要终止的进程，然后按下“结束任务”或者“结束进程”，最后关闭该窗口。
C:\WINDOWS\System32\msdos.pif
C:\WINDOWS\System32\msdos.pif

请关闭所有IE界面，重新使用HijackThis扫描一次，选中下面建议修复的项目，让HijackThis修复，修复前请允许HijackThis保留备份。（如果楼主知道是安全的可以不必勾选）
O4 - HKLM\..\Run: [MSDOS Security Service] msdos.pif
O4 - HKLM\..\Run: [Intec Service Drivers] msmsgr.exe
O4 - HKLM\..\RunServices: [MSDOS Security Service] msdos.pif
O4 - HKLM\..\RunServices: [Intec Service Drivers] msmsgr.exe
O4 - HKCU\..\Run: [Intec Service Drivers] msmsgr.exe
O4 - HKCU\..\Run: [MSDOS Security Service] msdos.pif
O4 - HKCU\..\RunServices: [Intec Service Drivers] msmsgr.exe
O4 - HKCU\..\RunServices: [MSDOS Security Service] msdos.pif

然后打开我的电脑→再点工具→打开文件夹选项→查看→把隐藏受保护的系统文件（推荐）和隐藏已知文件类型的扩展名的勾去掉→再显示所有文件→找到以下文件并删除：
C:\WINDOWS\System32\msdos.pif
msmsgr.exe（请用开始菜单中的搜索功能查找）