It would help to know the model number & specs. If your PC currently doesn't have Windows on it, you might want to consider something other than XP. If it originally came with XP, the original owner (you?) should have created the recovery discs shortly after the computer was purchased. The files & program necessary to create the discs are on the original HDD.You might want to consider trying Linux. Mint 18.1 Xfce or ZorinOS 12.1 Lite would be two possibilities. If you have 2GB RAM or less, get the 32-bit version.
Compaq Presario Cq60 Parts
Compaq Presario Cq60 Recovery Disc Download
Both are free.