Computer not detecting my phone..

[Hyperian]

For some reason after a while of plugging into the cradle and taking out, my computer stops detecting my phone connection and gives me this "USB device not regnized". When it worked it wouldn't have said anything and i can press the hot sync button and sync up.
But now when i press the button nothing happens, the phone gets stuck on trying to connect to the computer.

this seems to be fixed when i wipe the phone memory and start a new user profile.