hiwass, which drive are you using for scanning and at what speed?
Could you post a scan as a PNG picture file?
You can save the scan by clicking on the small floppydisk icon at the right-hand side of the Nero CD-DVD Speed title bar.
NEC drives are known to be quirky scanners, and if scans look strange at one scanning speed, it might help to change the scanning speed. Many people find that 8x is the worst scanning speed on NEC drives, and most use 5x.
Personally I use 12x because 5x is also a bad scanning speed on my NEC ND-4551A.