Welcome the CH. Volunteers here are ready to help you.
Your problem sounds very strange, almost as if there was a defect in the scanner.
First, you can make clear things about your problem.
Is this a case of where is was working, or did you just now start to use it the first time?
Are you using Windows 7 as the operating system on the PC?
Did the scanner come with a install CD? Did you use it?
Ifs the scanner is new and under warranty, you must return it ASAP.