i got my computer for xmas, it came with no cds, no paperwork and it had xp installed. so i fancied installing windows 7 and i did so but half way thru the installation my electricity cut off, so when it booted up again all that showed was a black box with cmd.exe on it. (i have no idea what that ment) so i got the windows seven installation disk, installed it all again and it worked fine, but now when i go on my internet five minutes later and my computer freezes completely. id rather like to know if installing xp would make it work again, or how do i restore it back to factory settings. i have an infinity computer, if that helps?