Somehow my system which was a genuine HOME edition has been overwritten by the copy that is now on my PC - how do I get it back to where it should be - the original software was preinstalled and I do not have a CD for it - my licence number is***** ***** 8G**F 69J** B**RG.
OR if I wish to UPGRADE to PROFESSIONAL do I get a discount because I already am supposed to have a licensed copy of XP HOME.