Ive also had problems with Superscan, mainly versions before the latest. For each scan several ports would appear open when they weren't. Also I don't think SuperScan scans UDP ports...

For Windows I like to use Scanline by Foundstone, its a command line scanner but has great functionality. Though these days I solely use Linux for these sort of things.

Check it out.

http://www.foundstone.com/index.htm?...c/scanline.htm