New issue on the block after installing KB 973917. Checking event viewer you would end up with
Event Type: Warning
Event Source: W3SVC
Event Category: None
Event ID: 1009
Time: 10:55:01 AM
A process serving application pool 'DefaultAppPool' terminated unexpectedly. The process id was '9878'.
The process exit code was '0xffffffff'.
To resolve this problem, reinstall Service Pack 2 for Windows Server 2003 on the web server.
Check out KB http://support.microsoft.com/?kbid=2009746
Before applying hotfix 973917 check whether it would break your IIS or not through this script
P.S: Script written by Punit Shah