MMC cannot open the file Today I had a problem with a server running Windows 2008 R2 and HyperV. We were unable to get into the HyperV manager and had an error “MMC cannot open the file C:\Windows\system32\virtmgmt.msc”.
I had a bit of a worrying time last week when a colleague upgraded an old (but live) Dell PowerEdge R310 server running Hyper-V with some new RAM. He powered down the old server, upgraded the RAM and booted the server back up. A few minutes later he was looking at the screen loading windows, when it failed. He put the DVD and tried to repair windows but when he got to the System recovery window it didn’t show any installations of Windows. He then looked to restore from backup to another server to get the Hyper-V clients running while we fix this server. Yes, you know what’ coming here, the latest backup we had…