I have a dead hard drive on a Compaq 7470. It was a 20 gig. I have a new WD80 gig drive. I used the software to format it and restarted with the win98 startup disk as per instructions. Then I put the compaq cd in but it will not install. It just restarts after choosing system restore from the compaq cd. Do I have to flash the bios to accept the larger drive. Please help with detailed instructions.