Win32:Malware-gen = Nightmare! Please help!

[Pondus]

I ran another Spybot scan and deleted another trojan (Win32.autorun.tmp). It also picked up "FastBrowserSearchToolbar" but it said it wasn't able to delete it because it might have been in use or something.

Can be false positives ?
You say in your first post that you have OTL, run it and post the log`s then Essexboy can have a look

[schmidthouse]

If you are connected you should update Malwarebytes as you are scanning with database 5363 and latest is 5391
have you tried doing a scan in safe mode ?

Not trying to interject here but for what it's worth, I have found many items doing a FULL scan in 'Safe Mode'that were not apparent otherwise. Also no chance of any other software interferring...for what ever reason.

Please try a Full Scan with MBam in Safe Mode (as pondos suggested)