Question : A process serving application pool 'DefaultAppPool' terminated unexpectedly

A process serving application pool 'DefaultAppPool' terminated unexpectedly

Answer : A process serving application pool 'DefaultAppPool' terminated unexpectedly

Sounds like it may be a driver problem on your server

http://www.iis-resources.com/modules/newbb/viewtopic.php?topic_id=2460&forum=5

"From a newsgroup post: "EventID 1011 is a generic error thrown by the World Wide Web Publishing Service when the IIS6 Application pool (w3wp.exe) crashes when an http request is being processed."

Hope this helps.