Hi spookytone,

What was the name and location of the infected file reported by avast?

In addition to Ad-Aware, I suggest you try Spybot Search & Destroy (another anti-Spyware program) and Ewido and/or a-Squared anti-Trojan programs (Ewido requires Win2000/XP).

Make sure you update before scanning.

Run these in safe mode if possible (Tap F8 while rebooting).