You may want to try to delete the drivers.

GMDriver and I had a weird problem getting TurnerPro working on Windows 7. Turnerpro RT worked one time. Next time, we found com 1 in use by another application. Deleted all com USB drivers. I for get if we had USB drivers on dvd or not. Windows 7 automatically installed. No problems since.

Delete hidden USB drivers ( the problem ones are probably hidden )
http://support.microsoft.com/kb/315539
http://www.tech-recipes.com/rx/504/h...-and-services/


To further diagnose the problem, reformat & reinstall Windows XP on your older laptop.

Robert