1. Make sure that the PC is turned off and disconnected from the mains.
2. Unscrew the side panel and remove it.
3. Discharge any static by either touching the metal side of the machine casing, or use a static discharge mat.
4. Locate the optical drives positioning in the cage.
5. Remove the front fascia panel using the clips to be found at the front of the cage.
6. Disconnect the power cable and IDE/SATA connector cable from the back of the optical drive.
7. Depending on the make and model of the machine, you will need to either unscrew the drive, or unclip it (these clips are often green or blue) and then slide the optical drive out of the front of the cage.
8. If in the previous step you had to unclip the drive you will need to check to see if the replacement drive has the same round torque screw on the side as the optical drive that you removed from the computer. If this is not the case, remove the screws from the old drive, and screw them into the new drive, in the same positions.
9. Slide the replacement drive back into holding cage, and in the case of non-clipped machines, replace the screws.
10. Replace the power cable and IDE/SATA cable into the back of the optical drive.
11. Close the side panel and replace the screws.
12. Plug the computer back in and turn it on.
13. At this point the BIOS should automatically recognise the new drive, and Windows should load normally. If this is not the case, check that the drive is connected properly.
14. Once Windows has loaded properly, it should auto-detect the new optical drive and install a driver for it. If this is not the case you will need to download the correct driver from the manufacturers website.