After applying MS June Patches to w2k SP4 system rebootet
you could ping the machine but after a while network response dropped Mousecurser and keyboard are frozen.
power off/on
boot in safe mode eventvwr showed some problems with Network card and Backup exec remote agent.
disabled bE Remote Agent.
reboot in normal mode works, and guess what .. if you start BA Remote agent afterwards, system stayed responsive. and you can Backup the Machine.
But BE RA Service must be in state "disabled", State "manual" leads to frozen system after reboot.
I tried to deinstall BE Remote agent rebooted, Reainstalled BE RA symptoms were the same.
Version of beremote.exe on client is 10.0.5484.0