hgdbc.dll is totally screwing up my computer

[FreddieKing]

OK so I visited a site to get a reg #, yeah I know they're all loaded with spyware and trojans but I haven't had anything beyond a tracking cookie in the last 2 years so I've gotten pretty cavalier about that sort of thing.

Anyway, I got rid of most of the stuff it installed but hgdbc.dll and a file it keeps creating cbdgh.ini keep coming back. It won't let me delete hgdbc.dll because it says it is in use, even in safe mode. Command prompt can't find the file. Spybot detects nothing. Neither does Ad-Aware, AVG or several on-line checkers. HJT crashes when I press "save log." My whole computer is running slow and weird. Somebody please help.

[FreddieKing]

Couple things I forgot to mention...

The files are located in C:\windows\sytem32\

It installs other (deletable) files on start-up, these are:
BMXBkpCtrlState-{00000002-00000000-0000000B-00001102-00000004-40011102}.rfx
BMXCtrlState-{00000002-00000000-0000000B-00001102-00000004-40011102}.rfx
BMXState-{00000002-00000000-0000000B-00001102-00000004-40011102}.rfx
BMXStateBkp-{00000002-00000000-0000000B-00001102-00000004-40011102}.rfx
DVCState-{00000002-00000000-0000000B-00001102-00000004-40011102}.rfx
wpa.dbl
cbdgh.bak1

The main thing it tries to do is redirect my browser to systemdoctor.com or winantivirus.com (which are both now in my hosts file).