Xp cd key lost

Restart your computer during the boot process you will see on the screen to press a certain key to enter setup usually the delete or F2 key

Press and hold that key during the boot up process to enter BIOS then using the arrow keys scroll down to advanced bios features press enter change your first boot device to cd press escape then press f10 to save to cmos to restart

note this will erase you operating system you will have to have an operating system disk to load it onto you hard drive or create a partition to load another operating system

note after you have loaded the operating system you should go back and change the first boot device to failsafe or optimised defaults

after windows has loaded

your computer will automatically restart it might restart 2 times one to finish the installation

the next will be because the operating system is loaded and will boot from your cd

if your installation disk is only a service pack 1 or 2 you might need to create an xp sp3 disk

http://windows.microsoft.com/en-US/windows/help/learn-how-to-install-windows-xp-service-pack-3-sp3

if you have a copy of windows service pack there is a program that allows you add service pack 3 to it so you have a copy of xp sp3
http://www.nliteos.com/changelog.html


hope this helps