Re: XP Home upgrade
thats a 3rd party application that basically replaces some system files so that your copy of xp looks like windows vista (aero theme, icons, etc).
it is still windows xp at the end of the day, and can always be reversed back to normal, it just makes it look a little nicer.
i had problems with it a while back, which might have been addressed now, but ive never been fussed to try it again
Laptop spec: ASUS X53E, i5 2430m 2.4ghz, 3gb ram, 320gb hdd, intel hd graphics, usb 3.0