Symantec System Recovery 2011 cause Server to Freeze When Job Starts

Hi

We are running SSR 2011 on Server 2008 R2.

Sometimes, but not always, a few seconds/minutes after a job starts the server freeze and need to be hard crash in order to come back to life.

Looking at the Event Viewer i see this massage:

"Unexpected failure. Error code: 490@01010004"

Searching a bit online, its seems to be related to Hyper V or all kind of Virtual Drives software.

We don't use Hyper V and we don't use any virtual drive software.

Our SSR 2011 is on version 10.0.0.39952 which seems to be the latest version.

Any idea what might be causing it?

Thanks

Dori