blue screen - Driver_corrupted_mmpool

I have an inspiron 2200.  Booting up I often get a blue screen with Driver_corrupted_mmpool at the top.

 

At the bottom of the blue screen there is mention of atapi.  Just below that it will show "memory dump to hard drive" and start counting from 1 to 100.

 

At 100, the laptop reboots and usually starts up and runs fine - that is, until I shut down and boot up again.

 

Any thoughts on what is causing this?  In my device manager, everything and all the drivers appear OK.

 

thanks,  jay