Why does your computer over heat?

Could be several things, if it is a desktop be sure that it has enough space around the case to provide for good airflow, a couple of inches on the back and one side is usually enough. Check your vents for dust, if you see dust and other gunk get some compressed air in a can and blow it out. Open up your case and check for dust built up around the fan and heat sink (this looks like a series of metal fins) blow out with compressed air. Listen to your computer and see if the exhaust fans are kicking on. You normally have to wait a little while for them to start running, if they dont kick on replace them!

If you are using a laptop be sure it is sitting on a hard surface if you leave resting on your bed or couch it will resrict airflow to the fans, casuing it to overheat, also blow out vents with compressed air. Dont try and take it apart unless you know what you doing though!

If your computer has been overheating often your processor could have sustained damage. If you fix the overheating issue you may find that your p.c. still acts wacky. You might have to replace your processor, or even other componets depending on how hot it actually got!!