White Macbook (2008) overheating and shutting down

Hello,
I have a white macbook from about 2008 (it is not unibody, it's the one you can remove the battery). My case has cracked all around and little pieces of the plastic have flaked away (as seen on all other 1 year+ macs of this generation). I figure this helps the heat escape rather than make the problem worse but I still plan to get the case fixed on with applecare.
My problem is that sometimes when running only iTunes and safari my CPU heats up to 90 degrees celcius (194 F) and my computer simply shuts off. I don't have the clear plastic covering vents and I just use my mac on my desk, not on a pillow or anything like that. When my computer heats up like that, the fan is rotating at about 6200+ RPM according to SMC fancontrol. Right now my computer is propped up using a large eraser to create a space for air to circulated along the bottom of the case.
What can I do to keep my Macbook from overheating? I don't want to damage my computer. I don't really do much video or real intense stuff, mainly just music.
Any help is appreciated.

Open Activity Monitor in the Utilities folder. Select All Processes from the Processes dropdown menu. Click twice on the CPU% column header to display in descending order. If you find a process using a large amount of CPU time (>=70,) then select the process and click on the Quit icon in the toolbar. Click on the Force Quit button to kill the process. See if that helps. Be sure to note the name of the runaway process so you can track down the cause of the problem.

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This question was solved.
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Welcome to Apple Discussions
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And
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This is not a reply. I just want to elaborate on this problem.
My computer freezes occasionally when it is used after being sleep for a while. The spinning ball appears and everything is totally disabled. Nothing on the keyboard works.
The mouse moves, but does not work.
The only solution is to turn the power off and on (losing all data in open applications.)
I kept the System monitor running on the side to find out which program was running when the computer froze. The Monitor as well as all other applications froze, but the data showed:
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White Macbook (2008) overheating and shutting down

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