Primax does not support the use of your scanner under Windows XP.
You can try to install the Windows 2000 driver.
Here is the link to the Primax web site.
http://www.primax.nl/
This is one of the "hidden" costs of switching to Windows XP.
Many scanners and printers are not supported under XP.
My personal rule of thumb on this is to check the hardware manufactures web page for a driver.
If they do not have a driver for XP, assume that you will need to replace the scanner.
I am keeping 1 W98 system on hand specifically because the scanner I have is not supported under XP.
Chas