Serial Driver Crashes on Win XP

Installed Solidoodle edition of RH along with serial driver. Tried printing RH crashed half way through. Tried restarting RH, crashed again.

Tried restarting PC and it won't even boot up.

Uninstalled RH and serial driver and it booted up.

Tried reinstalling same problem. Now I can't seem to uninstal serial driver again.

I definitely have .NET framework 3.5 .

Suggestions?