Help please. my dedicated server has stop working...how to fix it..i have tried to run the server in administrator but faild..please help..sorry for bad English.

Any antivirus programs running?

yes.......................................

Please add the server.exe to your exceptionslist

It can be either the anti-virus or some other firewall.

A crash at that point usually happens because the server can't validate at the masterserver (packets getting blocked)