More than likely the issue is that your scanner has a CIS element and not a CCD scanning element. For more info, see here:
http://ww.net54baseball.com/showthread.php?p=889094
also, if you do a search on "scanner recommendations" you will find a few thread here with great advice. You can't go wrong getting a Canon CanoScan XXXX or an Epson Perfection. Make sure to get a CCD based scanner.