Windows xp setup problem

I just recieved a used hard drive because my computer at start up would say " no Operating system found". I realized it was not recognizing the hard drive. I have now put in the other hard drive, it now recognises it. I changed boot order to cd first, and hard drive second. I start to install windows, i get to a point where it says "computer must reboot, setup will continue after reboot". After it restarts it just goes back to the beginning of setup and starts install at the beginning. Please if any1 knows what im doing wrong id be greatful for help. Im about to throw this damn computer through the wall.