Note (not sure if this is coincidental or related to the problems): I just loaded symantec endpoint protection across my firm.
Our windows 2003 server has recently begun not responding. All clients attempting to connect to its shares become completely locked up. The server is also completely inaccessible at this point (ctrl + alt + del does nothing, the screen is blue [not a blue screen of death], and I connect to it via VNC, RDP, or even check what's going on via connecting to it via another computer's computer management. If anyone has any ideas, please let me know! THanks