Hi Bev, and
As Sam said, we could do with a few more details, i.e. is this on Vista or XP, and if Vista, is the Belkin adapter Vista compatible?
If USB, have you removed the adapter before trying to start the machine?
Can you start the machine in safe mode (usually, press F8 at the first boot screen)? If so, you could try uninstalling the Belkin adapter, and see if it brings things back to normal.