AVAST sees Firefox10_Silent_EN.exe as a trojan

[Wedge1]

I am trying Avast Anti-Virus out for a change. I have always used Norton's but I wanted to try to find something that doesn't slow down the PC as much as Norton AV does. So, I turned to freeware.

I scanned my entire system after installing Avast last night and all was well.

This evening I try to connect to my Home network (LAN) and the silent installation executable of Firefox (that simon was so generous to create for us) is suddenly being recognized as the following trojan:

Win32:Trojan-gen. {UPX!}

Can anybody explain this to me? Avast is recommending that I "move to chest".

[MCT]

its a false positive most likely, i dont use simon's firefox, but i dont think he'd have a trojan in it, if you're lookin for a better antivirus that uses almost no memory & has amazing detection, ill reccommend getting Nod32 Antivirus

[Wedge1]

Thank you for the recommendation. I'll give it a test run. Can you add more about your experience with it?

EDIT/ Could you recheck the link you provided? It is timing out on me.

EDIT2/ Just googled it, no problem.

[MCT]

ive been using it for about a yr , its been amazing detects ALOT, new definitions daily, has the BEST (said by PC Magazine i believe) detection of wild viruses (viruses that arent known)

screenshot of the memory usage