Help. My daughter had a friend uninstall Vista and install Windows XP. NOW -- she wants Vista back and all we have is the product key, which is physically on the bottom of the computer (HP, purchased at Staples). No Installation CD came with the computer and Vista is totally wiped off of her system.

Any advice on obtaining a CD or reinstalling without one? Go to Staples and they may be able to help?

Thanks for any info.