You can always clean the registry values by changing your menu level to Expert or above, and then going View >> Delete All Registry Values.
thank you I didn't know that
Have you checked if you can get any communication via: Robot >> Test Message Link?
usb chimes, programs load, and firmware installs
Did you install the ROBOTC drivers on that laptop?
I thought that uninstaling then reinstalling robot c would do that.
Do your USB ports on that laptop work / have correct drivers?
Try these and see if your problem persists.
Hope that helps,