Vista Or XP
Read my post there; I answered that question.
As for the trojan...I've gotten that too, so I don't believe its anything to worry about. It just thinks that it's a trojan.
Edit: Just looked at my log, and yep, here's one on my external drive:
I:\System Volume Information\_restore{00EFF98B-5705-4D9A-BA78-7681A60AFB54}\RP431\A0077850.exe - probably a variant of Win32/Agent trojan