Something's starting invisible windows and defocusing my programs

http://www.computerhope.com/forum/index.php/topic,94971.0.html
Initial topic. Since this morning I've had random windows randomly lose focus, as if I clicked the desktop or similar. Fullscreen applications have also defocused, minimizing entirily to the blank desktop. In the last post of the initial topic there's a screenshot of a small tool that logs foreground window, which has caught two very peculiar lines when I was playing the Left 4 Dead 2 demo.

I was recommended to rule out malware and post the logs, so I did, especially since the two lines leads me to believe I've got something hiding.. Somewhere.
Attached are all three logs the sticky said you would need, and I followed every step in order.

[Saving space, attachment deleted by admin]

[Malware Removal Specialist]

C:\WINDOWS\system32\antiwpa.dll (Trojan.I.Stole.Windows) -> Not selected for removal.

Without a legal copy of Windows we can't help.

And if I remove said .dll? I'll have to spend a few hours digging around my closet after the key but eh. It'll be worth it if I get rid of whatever's minimizing my stuff.

[Malware Removal Specialist]

PM sent. Let me know when you get it sorted out.

[Malware Removal Specialist]

Please do the following:

1. Download this diagnostics tool MGADiag.exe and save this to your Desktop.
2. Double-click on MGADiag.exe and click Continue
3. When the program has finished, click on Copy
4. Post the results in your next reply.

This should do.

EDIT: Consider this solved. I found my Vista backup discs at my dad's and I've decided to do a full reformat and restore the OEM Vista that came with the computer. A boxed copy of Windows 7 will be arriving within a week, and I'll go from there. Thanks anyways!

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[Malware Removal Specialist]

Sounds good.

Stay away from cracks....