I bought this full version of xp because i had a lot of file damage done to my old xp so i just wanted to install this version over the top of my old version. Well i ran into problems as i read the fine print on the new xp box this operating system would only work on older systems like windows 95 or 98. Well my computer is a windows xp professional and it would not allow me to instal the new full version over my old operating system, it told me so when i tried to install the new system, so i will have to get a new harddrive and and a new op system. But the system i bought was mailed promptly, i would recommend reading the fine print carefully. Sincerely Robert Hadlock