Anyone on here good with VAG-COM?

[Mr Big]

I have been given a a USB OBD-II cable, and would like to be able to read and clear fault codes should the need arise. I have downloaded a couple of versions from Ross-Tech but I cant get either to work, and if I'm honest I don't know which type of cable I have got.

Can anyone give me a brief overview of what to do?

Beers for the willing candidate ;)

Thanks guys!