If you’re ordering a new PC, we’d go Windows 7, as that’s all you can order. We wouldn’t bother updating. XP is just as good, if not better than Windows 7 for most things, except security. If you need better security, then we still wouldn’t upgrade to Windows 7, we’d buy a specialist security product. Unless we were a bank, then we’d probably go Windows 7 and a specialist security product and a specialist security team. But we’re not, so we don’t. Stick with what you’ve got, order new PC’s with Windows 7 cause you don’t have a lot of choice. Never go Vista. If you have Vista, we feel sorry for you. We’d still only upgrade if it was causing you problems though, if it works, leave it.