I'm just guessing you have some HP or Compaq System Recovery CDs that put the OS back onto the HP or Compaq system. What a new to this area builder will discover is that these CDs are not usuable except on HP or Compaq systems.
I think you suspected that, but want to confirm it. Of course you can always try since firsthand experiences cement the answer for what you have.
If I was to build my own desktop, how would I run a system recovery if I needed to?