|Shut down the computer and let it cool down. Plan a course of action that involves doing some cleaning if necessary, potentially upgrading your BIOS (check your motherboard's manual or web site for details), or planning some system-cooling upgrades if necessary .|
If your computer is clean, your BIOS is up to date, and you're still having temperature problems, crack open your computer and check for damaged fans and heat sinks. Check for cracks, missing pieces, and make sure all the push pins are secure and all the appropriate fans are running. Secure and/or replace any loose or damaged cables. If you find you've got broken fans or a damaged heatsink, you can buy and install new cooling hardware for relatively cheap, and finding a highly rated, compatible fan or heatsink on a site like Newegg can potentially go a long ways toward keeping your computer cooler.