Could be a number of possible causes, but you're definitely on the right track in trying to wipe all traces of the previous install.
My first question/suggestion would be regarding starforce. Did you use the 'official' removal tool or simply uninstall? IIRC, simply uninstalling is insufficient as traces of the driver remain on the system.
If you need it the removal tool can be downloaded here:
http://www.onlinesecurity-on.com/protect.phtml?c=55
If that doesn't do it, I'd get a good registry cleaner and run a scan for any leftover traces of the program. You can get a good free one here:
http://download.cnet.com/Auslogics-R...-10909814.html
I hope you get it sorted, 'cause the reward is well worth the effort. Good luck Ken!