system restore disabled after virus attack

A few weeks ago my virus scanner (e-trust) alerted me that I was being infected by a W32.benmaazen virus. System shut down, but rebooted seemingly normal, although I lost Internet connection and got crazy error messages. It took me a few days to get the system working again, after I installed Avast and Teatimer. Since then System restore is disabled (whatever I do). Changed virusscanner to latest avast (e-trust was not working anymore) and discovered in the HKEy_CURRENT_USER\...MICROSOFT...\CURRENTVERSION\RUN the file
a58oq.exe, which I blocked with teatimer. Nevertheless all to no avail, it keeps popping up in my registry, even when regedit is open! Avast can't repair the thing seemingly and I can't get it out of my system. God knows how many files are infected. By blocking the thing with teatimer it does not (under this name) reappear in my running processes, but blocks every system restore point (only the last when rebooting). It affects also some changes in IE (resets always to 'normal safety') etc... But for the rest everything seems to be working normal. What to do???

 

You may have to run HiJackThis but in the meantime try SuperAntiSpyware.

Download the free version here SUPERAntiSpyware.com - AntiAdware, AntiSpyware, AntiMalware!

 

If you're running XP-Pro this page might help.

 

thanks BurrWalnutt, but essentialy the same

I downloaded and ran Superantispyware, al it found was a possible trojan baring the name BF4FM.DLL, located in ...C:\WINDOWS\SYSTEM32\
Had it quarantained, but no obvious difference in behaviour: still no repair points (only the last when I rebooted, thus today), still no possibility to alter my startup programs... Otherwise the system seems stable, it just doesn't seems to want to change some settings. (like the IE security setting)
What to do next???

Thanks anyway for helping me to remove 1 trojan (or son of the original one)
But my baby still stinks.
Jan