Hi everyone, I have a great solution.
So, I had this problem on Sunday, I did a system restore from Saturday (1 day before) and bam, no more problem.
For those who don't know how to do it, first think about which day it happened to you (for me, Sunday, February 15, 2009). Then go to
Start/All Programs/Accessories/System Tools/System Restore.
After that, a window will open, and you'll need to click OK for the first time, then you’ll see a calendar on the left side of the second window. Click on the day before the problem occurred (for me, Saturday, February 14, 2009) and then click Next.
Then it will restart and that's it.
Basically, your Windows will revert back to the selected date, for example, your computer was fine on Saturday and not fine on Sunday, so you're restoring the system to Saturday, your computer will forget the problems from Sunday =)
Don't worry, you won't lose any of your work, images, music, etc... it's just Windows going back in time.
If you have more questions, let me know. It works for sure.
See you!