Agfa scanner not recognised in Windows 2000

My agfa scanner (1236U usb)suddenly is not recognised by windows 2000. I have downloaded beta drivers for win2000/winxp that work ok in a new installation of windows 2000 but when i try to install them in my existingwindows 2000, after i run scanwise i get the message that the scanner is not connected.I don't know if the problem is related to the previous installation of the drivers that were in the cd and were just win95/98/nt, or some other software incompatibility.
 
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