I used the GQ-4X few months ago and it worked great. Today I tried using it on same system but after i plugged it in the USB the PC started toi want to load it as new HW and following the on screen instructions i get a message that i can't successfully install the HW. I updated the software from this website to lates version and still no luck. I have a Compaq system with AMD processor running XP with SP3. Also I had installed Norton security recently and I think it may have removed some files but i did re-install the programmer's SW and still no luck. Any advise? thnx