[LPDad]

have you cleaned all of the dust and crap out of your HSF??

Having a big fan blowing directly into the side of your puter is not going to keep it cooler, and in fact might even make your cooling problem worse. The reason is that you want AIRFLOW through the computer and over the HSF and OUT of the case.

If you have a big fan blowing directly into the side of the case then you run the risk of creating lots of air pressure inside of your case (right over your HSF/Processor) because the air getting blasted in by the fan cannot excape out the other side.
This is what happens if you have no way for all that air to excape--- to illistrate this: If you hold an empty coffee can with the open side toward you and you hold a feather right at the opening of the can and then you try to BLOW the feather into the can...you cannot do it. The harder you blow the farther the feather is pushed OUT away from the opening of the can.

(The big fan blowing into one side of your computer would work well only if you could completely remove the opposite side of the case so the air goes in, over your processor and out the other side without obstruction)

What you need to do is to somehow get nice airflow restored without using a big fan blowing directly into the case.

the long term solution is to put a small 80 or 120 mm fan on the side of your case blowing in and over your Vid card and processor and then have ALL of the fans on the back of your case EXAUSTING the air out the back. It really depends on the shape of your case, placement of PSU, and what the tangle of wires in your computer does to the airflow.
If you look at the pictures of Rastagard's computer you will see what a beautiful job he did with wrapping all the wires and cables so there would be good airflow. The Rastamachine really shows the right way to do it.

Hope this helps. For now, turn your fan down to LOW and set it on a STEEP ANGLE blowing into your computer from the front left side toward the back right side. and make sure all of your fans on the back are clean and blowing exaust. Get the AIR FLOWING.