I have a related thread here
but wanted to start a new one as everything points to a problem with BitDefender that has been deployed to many servers for our customers. 6 servers that all run SBS 2003 and BitDefender lock up (usually at night) and the screen is grey and keyboard stop working, only the mouse cursor is active. We wither need to to a hard reset or for those machines where Manually Initiated Crash is enabled we can get the memory.dmp file for analysis. Here is a similiar thread without a solution on BitDeffender forum:
Anybody has similar issues? or even better a solution. On one of the servers we have uninstalled the client for File Servers and Exchange but left the Management Console. We would probably need to uninstall that too and clean up and left overs in registry. But this will make our server vulnerable.