infected with pos tmp files

there is probably well over 1000 pos tmp files in my C drive and my C drive logo is a big red x, I had these files in my documents as well and deleted them but obviously the problem didnt go away. It has also made it so I cannot change my background image, I mean thats just a minor thing but even still its annoying. Also when I turn my computer on sometimes a DOS window pops up and then an error message saying that I cannot run DOS pops up. I just finished running spybot and it found the following:
Win32.Winlagons.co
Smitfraud-C.CoreService
Virtumonde.dll
Virtumonde
Virtumonde.prx
Virtumonde.sci
So please let me know what I can do to get rid of these files because spybot cannot get rid of them all and also doesnt get rid of the pos tmp files.
Thank you

Hi ifightbears

Click here to download HJTInstall.exe

• Save HJTInstall.exe to your desktop.
• Doubleclick on the HJTInstall.exe icon on your desktop.
• By default it will install to C:\Program Files\Trend Micro\HijackThis .
• Click on Install.
• It will create a HijackThis icon on the desktop.
• Once installed, it will launch Hijackthis.
• Click on the Do a system scan and save a logfile button. It will scan and the log should open in notepad.
• Click on "Edit > Select All" then click on "Edit > Copy" to copy the entire contents of the log.
• Come back here to this thread and Paste the log in your next reply.
• DO NOT use the AnalyseThis button, its findings are dangerous if misinterpreted.
• DO NOT have Hijackthis fix anything yet. Most of what it finds will be harmless or even required.

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