my sons g/f had her computer updated by some1 to vista from xp after a few months of use laptop now say it not genuine copy of vista she got genuine xp code on computer would it be possible to clean install xp as i got 2 genuine copys of xp as her computer was bought 2nd hand she not got any xp discs any help would be good
As long as the original XP whose Key is shown on the PC is no longer in use on any other PC, then I would say Yes, it is OK to install a Genuine XP and to use that Key. Have you still got details of the seller?
Within limits, as long as you have the installation keys, you can use any copy of the relevant XP CD.
You can't, for instance, use an XP home key with an XP Pro CD - and also the Service pack version of the CD normally has to match.
I've just done exactly this for a client - some clown had installed a pirate XP Pro onto a system with a genuine XP Home key. Replaced it with XP Home (from a CD from another system) and now all hunky-dory.
You should note that if the XP key is for the Education version then you can't use a non-education disk to install, certainly in XP Pro anyway.
I bought a spare copy of XP Pro from ebay which turned out to be the Education version. I used my XP SP3 slipstreamed disk to install on a new build thinking it would save a bit of time but it wouldn't accept the key. As soon as I installed using the 'Education' disk it recognised the key and went to to activate successfully.