one more non-related question.. how often should i clean out the inside of my computer?
How often does it get dirty?
Computers near the floor often collect more debris than computers on or in a desk. People who smoke or have pets often collect dust bunnies more quickly. (Smoking, btw, is one of the worst things you can do to your computer - the tar builds up everywhere.) Wood stoves or fireplaces can build film over CD/DVD lenses.
Not only do you need to get into the computer, but sometimes, even beneath the front panel. Many of those can be removed, but be careful to check how they're attached. The front fan will collect pet hair and clog completely. I once repaired an ancient horizontal desktop computer that kept destroying AT power supplies. The entire front panel was stuffed with cat hair - no air circulating through the case at all.
So check it periodically, and learn how long it takes for yours to need cleaning.