Comp Freezes, Sometimes BSOD When DVD Loads

When I am on the comp normally, on the internet, using Word, etc. it's all fine. The problem only starts when I try to play a dvd. Sometimes, it will play for a little while and then I hear a 'click' sound and the comp freezes. I would have to press the restart button for it to do anything.Other times, as soon as the DVD drive starts to load a dvd, a 'click' sound is heard, and it freezes.Sometimes, the same happens as above, and the BLUE SCREEN shows up- says something about memory dump..I don't know what to do! I've tried using a different programs to load the DVD, e.g. Power DVD, Windows Media Player, AVI... don't think it makes a difference now! (When I changed from Power DVD to WMP it worked for a week or so, then it started all over again! This problem started when I still had my old DVD drive, which was 8X and now I have a 16X. At first it was all fine, but a couple of weeks later it started again.