It is an old version (from 2005 -2006?) so it may well not work. Better to buy a (slightly) newer version if you can (X3 version 13 onwards - these are supported by Win7).
Hi, I think it is an old version as I've had it on my old computer for years, I was hoping it would work but no point risking it so I'll take your advice and buy something a bit new
thanks very much for the help, much appreciated