actually, if you are speaking of the task manager you get when you press CTRL+ALT+DEL and the little box that says CPU usage, that is the amout the CPU is being USED, not the amount free. So if you see a box that says 99%, that means the CPU is being utilized to 99% of it's maximum capacity, not 99% free. If that is the case, something is running in the background that is using ALOT of resourses, and it would also explain your heat problem. If you are getting that reading just sitting at the desktop at idle not running ANY programs, This is usually caused by spyware and viruses. Below I will explain how to take care of all that.
TO REMOVE SPYWARE
First, exit all programs. then, go to the system tray (the spot by the clock with all the icons) and exit out of everything there.
go to the control panel>add remove programs and uninstall anything that says my search, or toolbar, or search assistant, or download manager, or bargain buddy, or 180 solutions, and basically everything you see there that you dont recognize and use on a regular basis. DONT remove anything that says Microsoft or windows, or internet explorer or bears the name of any of your components, like ATI, NVIDIA, alienware... ETC. oh yea, KAZAA IS EVIL!!! If you are running KAZAA, relocate all your downloaded music to a folder not in the KAZAA folder, and uninstall KAZAA imediately.
Open up a browser window and type in ad-aware.com
This will take you straight to the download page for ad-aware SE. the best FREE spyware removal tool on the internet. (in my opinion) some of the others actually ARE spyware themselves.
Install ad-aware, uncheck all the boxes on the last page of the install wizard, then if ad-aware doesn't start automaticly, click on the icon it made on your desktop. DO NOT LET IT SCAN YET! click the globe in the upper right of the ad-aware window. this is the web-update. search for updates here, then when it is finished, let is perform a smart system scan. (this will take several minutes)
When it finishes, and you see a list, right click on any item on that list and chose "select all" from the popup menu that apears. then click next, and it should quarantine then delete any spyware left on your computer.
You may have to reboot, and let it scan again, if you get an error saying it could not remove certain items because they were in use. If the system locks up at any point during the scan, or when it is trying to remove the spyware, then restart the computer, and run the scan in safe mode. (just keep hitting F8 during reboot for this option)
If this doesn't fix your problem, you may have a virus. Either go buy or borrow a copy of Norton Antivirus, (if you already have it, make sure your subscription is up to date, and run live update) or try www.grisoft.com
and download AVG antivirus FREE edition. you have to sign up for it, but its free. The instalation and scan process for AVG are almost identical to ad-aware. post again if you have any problems with it.