Had one a couple of years back. Upgraded the attached PC OS to XP.Also used the AGFA drivers with same result.Eventually found a driver from, I think, driversguide.com BUT, it only worked intermittently, so....I dumped it.
Make sure you uninstall the earlier Scanwise version first and that the scanner is disconnected during the installation.
As I stated earlier, my 1212u works exactly the same as with earlier versions of Windows.
You can probably guess how long I've had it because it cost me just £32.33 including delivery on special offer from jungle.com; I snapped it up because it was being advertised elsewhere at up to £104 and on jungle.com's own dedicated Agfa products section for £75...:-)
I've tried that driver, after uninstalling the earlier Scanwise version, and reinstalling with the scanner disconnected but still get the same result, several times. I'm using XPHome, surely that could not make a difference? I'll trying it again and see what happens.