Exposé 'show all' keeps freezing my machine!

hi all,
been having an issue with exposé the last several days. about one out of every 15 times i use the 'show all' function, my computer completely freezes. i cant get to the force quit screen, and have to power off the computer and restart.
the freeze seems to happen about halfway through the 'show all' process.
anyone have ANY idea why this might be happening? its driving me nuts, and ive lost a ton of work this week because of it. ive already run disk utility and onyx, but the problem remains...
thanks,
mike

Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.

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