XP installation disk question

I have a Compaq presario that came preinstalled with WinXP. I found another comp with a bad HD in the trash. I replaced the HD and bought another copy of WinXP for it. My question: can I use the installation disk that I purchased for the other comp. with my Compaq's product key to do a clean install, or is the product key tied to a particular disk?

 

I have separate WinXP product keys for both computers. They both have official, microsoft-approved, activated XP OS's. It is an OEM install disk. Will I be able to use my Compaq 's product key to do a clean install onto my Compaq computer or will it only work with the OEM product key (which I used to install to the other computer) that was purchased with the disk? I've read here and other places that it is good to do a clean install every year or so to clean out the junk that accumulates in the OS eventually to keep things at peak shape.

 

People these days... do everything the legal way... blah blah blah.. lol there are much easier ways but since MajorGeeks does not support illegal activity... e-mail me if you want to know.

 

I don't.

 

Thank you AbbySue and Mastertech for your help, I really appreciate it.