I just posted about an odd issue so my experience _may_ help.
If you installed anything from the CDROM, and if by chance you're using vista (or not), try doing this work with the CD in the drive.
For some unknown reason to me, my OS was still searching for, and apparently finding and using a portion of the drivers on the damn CDROM drive.
Just my 2 cents learned from 2 days of hell. =)