In a message dated 19/03/2012 22:20:40 GMT Standard Time, [email protected] writes: The S&N CDs have something on them that allows them to be associated to one computer only. They won't work if you try to use them on another one The discs are licensed to the purchaser only, not to a particular computer. I don't understand how you get the impression they will only run on one computer. I bought several counties as well as London when they first came out, I run them on both a desk top PC and a laptop both using Windows XP, they also run on my Windows Vista desktop PC with no problem. I am no expert, but have you tried Windows compatibility wizard? That is meant to enable you to run older programmes, although I have yet to find the need. Jennifer