when I moved to Windows 7 I ended up with two scanners which arent supported.
I ended up getting VueScan basic version, I only tried it with one scanner and it works fine.
A bit expensive for my needs (I rarely scan) but preferable to buying even more hardware...
Take a look at VueScan http://www.hamrick.com/vsm.html. Says it supports 750 flatbed and film scanners.
I think it's about $40 with a Pro version for about $80.