Well, I recently came into possession of a PrimaScan Colorado 2400u. Unfortunately...I can't find drivers for Windows Vista...Was wondering if there was a workaround of some sort.
You can try VueScan. While it's not specifically on the list of supported scanners, you might just get lucky. I use it on the Mac for my CanoScan LiDE 20 since the CanoScan Toolbox is a turd.