Gray screen after screen freeze and finder+all programs restart.

Sometimes, (like 4 or 5 times a day) my screen freezer, i get a loading circle, a gray screen and then Finder and all my programs restart.
It's doing that since i updated to Osx lion.
Computers
     - 21.5" iMac 2010
     - 15" MacBook Pro 2006
Does anyone know what this is? And how do I solve this problem?
Because its shuts down everything im busy with (and doesn't save it).

I found this to work at least to get in and backup some files. It is VERY important to put these commands in EXACTLY as seen here, including spaces.
Boot into Single-User mode (Command-S while booting up)
Execute the following commands:
/sbin/fsck -fy /
/sbin/mount -uw /
mkdir /Disabled_System_Library_Extensions
cd /Disabled_System_Library_Extensions
mv /System/Library/Extensions/ATI* .
mv /System/Library/Extensions/AMD* .
touch /System/Library/Extensions
exit
I guess these two graphics extensions go bad quite often on Macbook Pro 15-inch.  They are part of the logic board. The only problem I had was I still couldn't get into my computer any other way, and the graphics for Safari were messed up.  Firefox was okay.  Good Luck!
Here's the original thread:
http://apple.stackexchange.com/questions/120507/boot-hangs-on-grey-screen-even-w hen-booting-from-usb-drive-with-fresh-os-x-inst

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