I am taking a backup of a host server with Hyper-V. i am using ArcServe r12 SP2. On this particular server, every time I take a backup, the host server goes to BSOD however the host server does not shut down. I only notice there is a problem when I log on and find a window to leave comments for reasons of the unexpected shut down. I ran Blue Screen Viewer and found that the drivers that are in conflict are ntoskrnl.exe and storvsc.sys. I've googled it and it seems that the problem is related to HyperV. I think this is correct as I isolated the backup of the Hyper-V VSS Writer (using ArcServe) and it failed. The backup will always stop at the point of accessing Microsoft Hyper-V VSS Writer. I have other servers with the same setup and don't have this problem so I wonder if there is someone out here who can enlighten us. Thanks in advance.