X crashing after upgrade: urgent!

["Dr. Jennifer Nussbaum" <bg271828@yahoo.com>]

Hi. Im running Sid on a Thinkpad T60, and recently rebooted my machine after having done several updates recently. I now find that X is crashing hard on boot, rendering the system unusabler. My Xorg log shows the same backtrace thats reported in this thread:

http://www.linux-archive.org/debian-user/369120-x-server-hangs-debian-squeeze-after-upgrade.html

But my system doesnt crash randomly, it wont even start in the first place.

I reinstalled all xorg modules, and the mesa libraries (someone in that thread suggested this) but it still crashes in the same way. Im not using a config file, i just use the automatic one, and i dont want to do anything fancy.

I am supposed to give a presentation tomorrow with this laptop and its the only one i have so Im DESPERATE to get this resolve.... 

Would be very very grateful for any help at all!

I am willing to downgrade X but dont know how to do this. Or if it will help.

Thanks!

Jen