Assuming you have room inside the case for the old drive, look at it, it should have a diagram showing how to set the jumper (for me, connecting my old drive after an upgrade was as easy as removing the jumper.) You need to set it as "Slave." Now open your case. I would suggest you be very careful not to touch any circuit boards, even if the power is off, you can still fry it by accidentally shocking it (like when you rub your socks on the carpet. Secure the Harddrive in the open slot with a screw or two and connect the open spot on the ribbon cable to the drive (make sure it is orientated just as it is for your primary drive.) Now just connect one of those power cables to the drive (Red Yellow black one with 4 wires.) Close it and plug it in and fire it up. By default most bios are set to automatically detect new drives, so you shouldn't have any problems there. Load windows and right click on the new drive, select format and do a complete format.