Win XP install

I need to replace a failed hard drive in my fathers HP notebook. It originally came with Win2000 which he later-on purchased and installed a retail copy of Win XP upgrade. After replacing the failed drive with a new one will I have to first install Win2000 and then apply the WinXP upgrade or can I just do a straight WinXP install from the upgrade CD? If not can I use my WinXP CD which is a full OEM WinXP SP2 CD but just use the activation code that came with the upgrade CD?

Thanks,

yeh, use the oem disc and the upgrade key

Normally, you can do a full install from an upgrade CD, as long as you have the original version you are upgrading from.