Well my computer did this awhile ago. I then got Windows 7 hoping that would help, but it kept doing thta. Called microsoft and everything and we would fix it for a little while then it would do it again. I can still hear music, but nothing will work. My computer is not even a year old, but I don't know what I could do to fix it. I played yesterday for an hour without anything and I just made sure I didn't click all over the place (I tend to do that). If you have any websites that would help that'd be great. I have tried everything.
So, you upgraded to Windows 7? I dunno for sure, but maybe this is the core issue. I heard when people upgraded their machines from XP to Vista there were a lot of hardware related error reports and since Windows 7 has a lot in common with Vista... but like I said I dunno, you should check out the microsoft forums, tweakers.net, etc.
Anyways here are a few free maintenance prog's I use:
http://www.piriform.com/ccleaner
http://www.piriform.com/defraggler
http://free.avg.com/ww-en/homepage
http://www.malwarebytes.org/
http://www.thewindowsclub.com/ultimate-windows-tweaker-v2-a-tweak-ui-for-windows-7-vista
I use register mechanic for cleaning my register but it isn't free however.
So maybe this will help: http://www.freedownloadscenter.com/Search/registry_cleaner.html
Dunno if it's free but I used this in the past: http://www.errorexpert.com/download.html
And here is a great video for basic computer maintenance + utilities:
Computer Maintance Tips - Part 1: http://www.youtube.com/watch?v=rS13EMF3M3o
Computer Maintance Tips - Part 2: http://www.youtube.com/watch?v=1b80UKCDgi4
*Edit* Gamebooster is a nice utility for all your games btw, turns off unnecessary services/programs while playing:
http://www.iobit.com/gamebooster.html