hello there i have a question, a friend has a legal copy of Window XP 64-bit that he is willing to sell as he recently purchased vista ulimate x64. i have been considering vista home prem but he is willing to sell his copy of xp at a much lower price and tbh would be silly not to buy it. Before you jump the gun, i dont game, and if i get the bug to play a game its usually retro (DX9C) lol! this summer i wish to get vista but again that will be 64-bit. so is it worth buying the 64-bit version of XP, my machine is mainly work based, solidworks 2008, autoCad 2008 and CS3 creative suit, i understand that 64-bit can run 32-bit app's i.e Office 2003 pro. the reason for all this is i have another 2GB of cruical ballistix PC6400C4 on its way, to match with my current 2GB, seriously good memory, been running at 1200mhz for a while 1GHz for a while!