Freezing Problem?

So for about 2-3 weeks I had this infinite freezing problem.  I would leave my comp over night only to wake up to it frozen.  At first I just thought it was a driver issue somewhere inside of my hardware specs so I looked around and updated all of the drivers that I had.  I noticed that my video card driver was out of date so I updated it.  That night there was no freezing. After the second night though, I woke up and bam, frozen again.  I was completely clueless.  After trying everything I knew, and checked out the many different solutions posted on Google. I decided to drop my old card back in.  I was using a GeForce 7900 when the freezing was going on.  I had a card that I used before, an ATI Radeon something or another, so I threw it back in and sure enough the freezing was gone.  Now I can leave my computer on all day and night and don't have to worry about freezing or any other issues. Whew.  Someday I'll stop running into different problems, but until then I will keep learning from them.  Until my next issue :)