I have a 4 year old JIB with a serial to USB adapter. My laptop runs XP with current SP's installed. Usually I can run both VMSpec and my Street Atlas with GPS but today the VMSpec would not run more than a few minutes without locking up. What can be done to make this unusable device work. I find it unacceptable that I can not run these 2 usb devices together. Sometimes they behave for days without failing and other time like today VMSpec hangs up almost immediately. At least the GPS can be unplugged and replugged to restart easily. Not so with the VMSpec. I have to stop the coach. Turn off the engine, end the program, and restart the program and then start the engine and hope for the best. All to often I get a blue screen of death on the laptop. What can be done PLEASE. Ted