I'm running a server with Server 2000 SP4 and running backups nighlty with Brightstore ARCserve r11.5 SP2. Something is happening overnight that is completely locking up the server. When I come in I have to power it down and power it backup. When it's locked up I can ping the server but can't remote to it or access any shares via name or IP. The System log is flooded with Event ID 2000 "The server's call to a system service failed unexpectedly". There's also a few Event ID 4224 referring to WINS. Any ideas?