I had the same issue, - had a brain snap and removed the SD card.
finally managed to resolve the issue - i purchased a new sd card, put the card in an adapter and inserted it into the computer.
The PC suite interface (after updating to the latest version) then prompted me to download and install the initial running/boot up sofware required to run the scanner. (which it had not done in previous attempts)
Downloaded and updated all vehicle data,
plugged in and it was up running again.