For your driver, go here to
Umax.com . In the list choose your model scanner, and operating system.
But, this is posted on the web page:
Windows XP users: A Windows XP Patch is required. Use the form above to check for Windows XP compatibility. All UMAX parallel port scanners (i.e., Astra 300P, 600P, 610P, 1210P, 1220P, and 2000P) are not supported under XP.
So you may be out of luck. They may release a driver some day but haven't yet.