When was the last time the dust was cleared out?
Download Speedfanand install it. Once it's installed, run the program and post here the information it shows. The information I want you to post is the stuff that is circled in the example picture I have attached.
If you are running on a vista machine, please go to where you installed the program and run the program as administrator.
(this is a screenshot from a vista machine)
So that we have a comparison to Speedfan, download, run and grab a screenshot of HWMonitor (free).
To capture and post a screenshot;
Click on the ALT key + PRT SCR key..its on the top row..right hand side..now click on start...all programs...accessories...paint....left click in the white area ...press CTRL + V...click on file...click on save...save it to your desktop...name it something related to the screen your capturing... BE SURE TO SAVE IT AS A .JPG ...otherwise it may be to big to upload... after typing in any response you have... click on Upload a File to add the screenshot.
Screenshot instructions are provided to assist those that may read this topic but are not yet aware of the “how to”.
How old is the system?
Could be hardware failure
HDD
RAM
Motherboard
Power Supply
What version of windows?
Start the system in Safe Mode to see if this replicates.
Have you tried a different user to see if the same thing happens?