**//Preview problem with UMAX 2200 scanner

I managed to somehow install my UMAX Astra 2200 scanner under XP. It scans very well but only in JPEG format. The problem I am facing though is that in Vistascan, when I click on the Preview button, I cannot see a preview. Instead what appears is a scrambled picture - just some colored patches. With this preview, if I click on Scan button, then view the scanned file in a viewer like ACDSee, I can see a very beautiful scan. What this issue amounts to is that even if I have a small picture to scan, say a 4x6 print of a photograph, I will have to scan the full 11x8 area and then go to photoshop to crop the part my picture is in. Because the preview won't show me the picture! Anyone faced this problem? Or is it because I did not install the MagicTouch, Monitor and Printer profiles?

Thanks.