While there is no official XP driver, I futzed around a bit and found you can use this scanner perfectly in XP if you do the following:
1. Make sure the scanner is NOT PLUGGED IN!
2. Unzip the file maxkernl.dll to the folder C:\Windows\system32.
2. Unzip the included Win2k driver installer and run it.
3. Plug in the scanner.
4. If/When you get the message that it can't find the file Vipersti.dll, browse to the folder C:\windows\inf\vizPnP.
5. Happy scanning!!!
(I figured this out because I found this scanner for $3.99 at a Thrift store, I just HAD to take a shot at it...)