Go to
this download page on the UMAX site and select your device (Scanner), then your scanner model (Powerlook 2100XL) , and your operating system, then press the "SEARCH" key.
Each page in the Download Area is in two languages - first German, then English, so page down to the English section.
Follow the instructions to download the correct driver for your scanner / operating system combination.
Note there is currently no driver available for Windows Vista.
When you've tried this solution, don't forget to rate it !
Good Luck.