Hi I have a 2003 Server It is a Dell PE 2800 The server is running no services other than those necessary to boot. It is running a custom application that runs on all other servers with no problems, the other servers are the same or similar dell servers. When the server freezes what happens is the users notice they have no connectivity to the Custom application When investigating on the server there is mouse control but no keyboard input is available. The server must be hard booted on reboot and investigation of the event viewer the error codes 333 the source is Application Popup the description reads "An I/O operation initiated byt the Registry failed unrecoverably. The Registry could not read in or write out or flush one of the files that contain the system's image of the Registry. The other error code is Event ID 2019 Source: Srv Description is "The server was unable to allocate from the system non-paged pool because the pool was empty. These errors occur multiple times until the server is unable to respond and is ultimately hard booted. There are no other errors on reboot. In researching other forums I am not seeing any real consensus on how when where or why this occurs. This server is not running any anti-virus anymore as we noted that some anti-virus applications caused problems. There are NO other applications installed on this server other than the Custom Application which does appear to be causing the problems and also works fine on all other servers. Does anyone have any ideas??