win32 root/kit slowly killing computer need help please

here is the r/kill file

This log file is located at C:\rkill.log.
Please post this only if requested to by the person helping you.
Otherwise you can close this log when you wish.

Rkill was run on 05/25/2011 at  0:08:45.
Operating System: Microsoft Windows XP

Processes terminated by Rkill or while it was running:

C:\Documents and Settings\All Users\Application Data\yiMjvSkpKyOa.exe
C:\PROGRA~1\Yahoo!\MESSEN~1\ymsgr_tray.exe
C:\WINDOWS\system32\wdfmgr.exe
C:\Program Files\Common Files\McAfee\SystemCore\mcshield.exe
C:\Program Files\Common Files\McAfee\SystemCore\mfefire.exe
C:\WINDOWS\system32\wscntfy.exe
C:\WINDOWS\system32\dlcccoms.exe
C:\WINDOWS\System32\vssvc.exe
c:\PROGRA~1\mcafee\msc\mcupdmgr.exe
C:\Program Files\Secunia\PSI\sua.exe
C:\Program Files\Malwarebytes' Anti-Malware\mbam.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\iexplore.exe
D:\iExplore.exe
D:\iExplore.exe

Rkill completed on 05/25/2011 at  0:09:17.
Please post this only if requested to by the person helping you.
Otherwise you can close this log when you wish.

Rkill was run on 05/25/2011 at  0:47:01.
Operating System: Microsoft Windows XP