Personally, I'm of the opinion that Timisticus' problem is due to overheating, and he most likely needs a new fan (at least) for his CPU. I'm up here in the Texas Panhandle where dust was invented, and fans tend to have short, ugly lives. So, Timisticus, even if the computer is just a couple of years old, you could still have a sick CPU fan. That's an area where manufacturers often find a corner to cut.
Sometimes, you can simply replace the CPU fan with a model that moves more air; but it's often less hassle to buy a new heatsink/fan assembly. There are plenty of coolers in the $25 to $30 range that should be better than your stock hardware. Just make sure you pick one that works with your computer's physical layout and space limitations, and be sure that the CPU is thoroughly clean before you mount the HSF.
You might also want to look at what sort of cooling your case has. Lots of manufacturers use crappy exhaust fans that manage to be noisy, and have low airflow at the same time. $8 to $16 bucks can buy you a quiet fan with high ariflow and low noise.
I like Arctic, NZXT, and Xigamatek in the $25 to $30 range in CPU coolers, and for case fans, I'm a big fan of Silenx line of fluid bearing fans. Great airflow, low noise, and long life. Don't confuse the fluid bearing fans with the cheaper, junkier fans Silenx also makes.
Edited by slgrieb, 30 September 2013 - 11:40 AM.