I had the same thing with a Sony, I burn a CD and it was never the same, stop reading PC CD and only DVD'S and music CD then that stop reading them. I bought one for £ 24.99 at PC world, which comes with a burner,DVD and replaced it and it works fine.
UNPLUG COMPUTER ! You need Philip's screw driver, take sides and front cover off, unscrew the screws holding your old one. You should have 3 plugs to unplug from it. One big main in the middle and 2 smaller one on each side. Slowly pull out old driver and watch how much lead you have with cables. Unsnap them and be careful they don't drop down cause you might have some plugs that look the same but not in use. Small hands and fingers do help. lol.
Once unplug / replug your new one in the same way slide it back carefully not to pinch any wires. screw it back on, covers back on and your ready to plug computer back in. once computer come on it will tell you what you need to do and CD that came with it to add the softwear it came with. hope this helps.