trojan horse generic9.aavj help

I recently got the trojan horse generic9.aavj and I realize there's another thread on it, but I also have some additional questions.

What exactly does this virus do? Are any of my passwords at risk? Should I change all the passwords saved on FF? I haven't used any passwords since getting this virus, and I've used a fake password to make this majorgeeks account.

When I use hjt, it alerts me that my system does not allow write access to the Hosts file. Is this the virus's doing or does it have something to do with me having Vista?

Here's my hjt:

Logfile of HijackThis v1.99.1
Scan saved at 8:50:10 PM, on 7/28/2008
Platform: Unknown Windows (WinNT 6.00.1905 SP1)
MSIE: Internet Explorer v7.00 (7.00.6001.18000)


Edit by chaslang: Inline HJT log removed. READ & RUN ME sticky not followed.

 

Paranoid Question about a trojan virus

I recently (3 hours ago) got a "trojan horse generic9.aavj" virus.

My AVG said it deleted it, and so far, it hasn't popped up again.

However, I am severely paranoid about viruses and I have some questions.

What does this virus do? Can it keylog? Are any of my passwords at risk? Do I need to change all of them?

I couldn't find any information or answers to these questions online, so I apologize if they seem dumb.