Logfile of HijackThis v1.99.1
Scan saved at 14:35:39, on 2005-7-28
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:\Program Files\rising\Rfw\rfwsrv.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\rising\Rfw\RfwMain.exe
E:\PROGRA~1\RISING\RAV\RAVMON.EXE
E:\PROGRA~1\RISING\RAV\RAVTIMER.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\WINDOWS\System32\ctfmon.exe
C:\WINDOWS\System32\nvsvc32.exe
E:\PROGRAM FILES\RISING\RAV\CCENTER.EXE
E:\PROGRAM FILES\RISING\RAV\Ravmond.exe
E:\PROGRAM FILES\RISING\RAV\RavStub.exe
D:\Program Files\Tencent\QQ\QQ.exe
d:\Program Files\Tencent\QQ\TIMPlatform.exe
E:\Program Files\Tencent\TT\TTraveler.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\WinRAR\WinRAR.exe
F:\Program Files\TTPlayer\TTPlayer.exe
F:\Program Files\Chinagames\iGame\iGame.exe
f:\Program Files\Chinagames\iGame\bbRing.exe
f:\Program Files\Chinagames\iGame\NewBilliards.exe
D:\HijackThis.exe

R3 - URLSearchHook: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\Program Files\3721\Assist\asbar.dll
O2 - BHO: ST - {9394EDE7-C8B5-483E-8773-474BF36AF6E4} - C:\Program Files\MSN Apps\ST\01.03.0000.1005\en-xu\stmain.dll
O2 - BHO: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\Program Files\3721\Assist\asbar.dll
O3 - Toolbar: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\Program Files\3721\Assist\asbar.dll
O4 - HKLM\..\Run: [RavMon] E:\PROGRA~1\RISING\RAV\RAVMON.EXE -SYSTEM
O4 - HKLM\..\Run: [RavTimer] E:\PROGRA~1\RISING\RAV\RAVTIMER.EXE
O4 - HKLM\..\Run: [桌面图标文字自动透明] D:\Program Files\Wom\WinMem.exe XP
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\System32\ctfmon.exe
O8 - Extra context menu item: &使用迅雷下载 - F:\Program Files\Sandai Technologies Inc\Thunder\geturl.htm
O8 - Extra context menu item: &使用迅雷下载全部链接 - F:\Program Files\Sandai Technologies Inc\Thunder\getAllurl.htm
O8 - Extra context menu item: 添加到QQ自定义面板 - E:\Tencent\qq\AddPanel.htm
O8 - Extra context menu item: 添加到QQ表情 - E:\Tencent\qq\AddEmotion.htm
O8 - Extra context menu item: 用QQ彩信发送该图片 - E:\Tencent\qq\SendMMS.htm
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: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
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)
O10 - Unknown file in Winsock LSP: c:\windows\system32\cdnns.dll
O11 - Options group: [!CNS]  上网助手-地址栏搜索
O14 - IERESET.INF: START_PAGE_URL=http://www.microsoft.com/
O16 - DPF: {DA984A6D-508E-11D6-AA49-0050FF3C628D} (Ravonline) - http://download.rising.com.cn/ravkill/rsonline.cab
O16 - DPF: {DE3496D2-AFB9-47EB-A8C2-C3B330222513} (PhotoUpload Control) - http://www.photo.163.com/PhotoUpload.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{D4AFD2D2-C3F0-4D26-804B-1449F7EE03D0}: NameServer = 202.96.128.143,202.96.128.68
O23 - Service: Gray_Pigeon_Server (GrayPigeonServer) - Unknown owner - C:\WINDOWS\svhcost
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Program Files\Common Files\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Rising Personal Firewall Service (RfwService) - Beijing Rising Technology Corporation Limited - C:\Program Files\rising\Rfw\rfwsrv.exe
O23 - Service: Rising Process Communication Center (RsCCenter) - rising - E:\PROGRAM FILES\RISING\RAV\CCENTER.EXE
O23 - Service: RsRavMon Service (RsRavMon) - Beijing Rising Technology Co., Ltd. - E:\PROGRAM FILES\RISING\RAV\Ravmond.exe

【回复“林萍”的帖子】
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。）
停止并禁用服务: Service: Gray_Pigeon_Server (GrayPigeonServer)

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）
O23 - Service: Gray_Pigeon_Server (GrayPigeonServer) - Unknown owner - C:\WINDOWS\svhcost

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。 用WINDOWS的查找功能进行查找并删除：
C:\WINDOWS\svhcost

请参考：灰鸽子2005手工查杀方法总结
http://forum.ikaka.com/topic.asp?board=28&artid=5666824

中灰鸽子会不会影响电脑运行速度?