Well....
At 2am I got it to work.
Flashed and read it a couple of times and no problem.
Plugged it into the truck this morning....no go. Laptop wouldn't recognise the USB device.
So...drove my wife's car to work and brought the PCM with me and plugged it into my laptop again.
Works!!!
We'll see what happens this afternoon when I get home.
I'm running XP and V7.5.4 so I should have the most upto date drivers