From what I recall, I didnt install any drivers. I did have htc sync installed on my pc though, but unless the mpe software installs drivers then I didnt install any. It just worked.Sorry to be a pain Mick, i've installed the client on the phone and opened it, oped the software on the laptop and plugged the phone in as disk-drive with usb de-bugging selected and the phone isn't recognised. I'm not sure if the issue is the usb drivers, could you post a link to the correct drivers, i've tried the one on the sd card, along with the latest from HTC and still can't get it to work, like your screen btw!
Have you gone into the settings and connected over wifi? if not try to connect laptop to phone that way first, perhaps then it'll connect over the usb. Sorry I'm not much help but its a while since I installed the software, and I'm struggling to think why it wont connect.