I have found that Hyper-V is easily broken by any on access virus scanning software. To make life easier, if you are running Hyper-V, or plan to. Put these exclusions in your vurs scanner:
- Default VM configuration directory: C:\Program Files\Microsoft\Windows\Hyper-V
- Custom VM configuration directory
- Default virtual hard disk directory: C:\Users\Public\Documents\Hyper-V\Virtual Hard Disks
- Custom virtual hard disk directories
- Snapshot directories
- C:\Windows\System32\Vmms.exe
- C:\Windows\System32\Vmwp.exe
Posted by halo76 
