Windows Server 2008 R2 Tag

We have found a really annoying and recurring problem on some of our Windows 2008 R2 servers.     The Hyper-V virtual machines will not start after a reboot. You cannot create or mount virtual drives in Disk Management.     The problem seems to randomly appear after a reboot. The problem also appears to be related to either Adaptec SCSI cards or Backup Exec.     Uninstalling and re-installing the Hyper-V role does...