Being new to this forum I just want to share my experience with EFI Live and Windows Vista. I currently run EFI on a Gateway Laptop (Core 2 Duo processor, 2 GB memory) running Vista Premium. My first experience was the laptop would loose connection with the handheld about 40% of the time when switching applications (i.e. switching between the tuning program and the scan program). I found the following procedure works just about every time:
1. Start program.
2. Plug USB cable from handheld into laptop
3. Plug OBD II connector into vehicle.
4. Turn on ignition.
5. Use scan/tuning program.
If you need to switch between programs, I disconnect both the USB and OBD II cables and repeat this procedure.
Hope this helps others out. Welcome to the world of Windows Vista....