We've just installed a new NOD32 Enterprise 2.51.26 (15 user) on NT4SP6a server and everything is running at warp speed. However now the server will not shutdown/restart. Have tried reinstalling RAC and RAS v1.0.9. No effect. Ending nod32ra.exe from task manager causes error "cannot respond to end task request". The only workaround is to stop the service in Control Panel with error "An application error has occurred" Then we can shutdown the server. There are no clues in the ra logfile Any ideas on what to try next?