中了 TROJAN.DESKTOPHIJACK.B, 怎么删也删不了,桌面被劫持, 怎么改也改不了, 瑞星也奈何不了,求助大虾

症状：每次启动时桌面被篡改, 也不能够改回来,桌面底色为黑色中心部位有个区域上显示: WARNING! YOU'RE IN DANGER!...
鼠标放在上面会变为手状, 点击会进入一个网站, 在网上查询是中了 TROJAN.DESKTOPHIJACK.B 病毒, 但是用瑞星无法删除. 照SYMANTEC 上讲的方法也没办法，请予指点,谢谢

（在显示属性里只有“屏幕保护”“和设置”两个页面，其他的“主题”“桌面：“外观”都不见了，在我的电脑里选择图片直接设置桌面也不成功，ACDSEE7 也打不开了。总之就是改不了。请指点）


Logfile of HijackThis v1.99.0
Scan saved at 22:36:16, on 2005-7-2
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\3721\assistse.exe
C:\PROGRA~1\RISING\RAV\RAVTIMER.EXE
C:\PROGRA~1\RISING\RAV\RAVMON.EXE
C:\WINDOWS\System32\ctfmon.exe
c:\program files\rising\rfw\RfwMain.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\PROGRAM FILES\RISING\RAV\CCENTER.EXE
C:\PROGRAM FILES\RISING\RAV\Ravmond.exe
C:\WINDOWS\System32\svchost.exe
C:\PROGRAM FILES\RISING\RAV\RavStub.exe
C:\PROGRA~1\GENIAT~1\美如画~1\CCTVPro.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Documents and Settings\Administrator\Local Settings\Temp\HijackThis.zip 的临时目录 4\HijackThis.exe

R3 - URLSearchHook: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRA~1\3721\Assist\asbar.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: Anti Fish - {38928D50-8A48-44C2-945F-D2F23F771410} - C:\Program Files\3721\Assist\Angling.dll
O2 - BHO: QQIEHelper - {54EBD53A-9BC1-480B-966A-843A333CA162} - F:\Program Files\Tencent\qq\QQIEHelper.dll
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Program Files\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.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: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Program Files\Adobe\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: 上网助手 - {BB936323-19FA-4521-BA29-ECA6A121BC78} - C:\PROGRA~1\3721\Assist\asbar.dll
O3 - Toolbar: 卡卡安全助手 - {DB9ECD4F-FB8F-4311-B3CE-90B976C2707C} - C:\WINDOWS\System32\KakaTool.dll
O4 - HKLM\..\Run: [assistse] "C:\PROGRA~1\3721\assistse.exe"
O4 - HKLM\..\Run: [CnsMin] Rundll32.exe C:\WINDOWS\downlo~1\CnsMin.dll,Rundll32
O4 - HKLM\..\Run: [RavTimer] C:\PROGRA~1\RISING\RAV\RAVTIMER.EXE
O4 - HKLM\..\Run: [RavMon] C:\PROGRA~1\RISING\RAV\RAVMON.EXE -SYSTEM
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O8 - Extra context menu item: !搜一搜 - res://C:\WINDOWS\downlo~1\CnsMinEx.dll/1003
O9 - Extra button: 手机短信 - {00000000-0000-0001-0001-596BAEDD1289} - http://sms.3721.com/ie/index.htm (file missing)
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: 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: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - C:\PROGRA~1\YAHOO!\MESSEN~1\YPAGER.EXE
O9 - Extra 'Tools' menuitem: Yahoo! Messenger - {E5D12C4E-7B4F-11D3-B5C9-0050045C3C96} - C:\PROGRA~1\YAHOO!\MESSEN~1\YPAGER.EXE
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] 上网助手-地址栏搜索
O16 - DPF: {5DD731E6-D4F0-11D3-BE3F-00105A6FDA50} (V3ProX Control) - http://origin-www.ahn.com.cn/aspservice/plugin/myv3.cab
O23 - Service: NVIDIA Driver Helper Service - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Rising Personal Firewall Service - Beijing Rising Technology Corporation Limited - c:\program files\rising\rfw\rfwsrv.exe
O23 - Service: Rising Process Communication Center - rising - C:\PROGRAM FILES\RISING\RAV\CCENTER.EXE
O23 - Service: RsRavMon Service - Beijing Rising Technology Co., Ltd. - C:\PROGRAM FILES\RISING\RAV\Ravmond.exe