You know those older machines that have IDE and you bought A SATA drive and having a hard time doing well this might help you
1.Look on the board for a little word called SATA (small print) and it has a light usually
2.You'll see a little plugin right above it Then the Big plug on your SATA drive (Power supply)
3.You have to get this red cord that connects to the power supply to the SATA connector (frys.com)
4.If you already have done steps 1-3 then al you have to is put your Windows disk in and install
Good luck