error 0x8000FFF in hyper-v windows 2008 server R2

Hello,

here is my problem: when I start my VM, I receive the error "fail to restore" with ID 0x8000FFFF.

I tried to apply the fix described in this page: https://support.microsoft.com/en-us/kb/2960802

However, the command "Net start vmhostagent" returns the error "invalid service name".

Is it because it only works on a windows server 2012 R2?

If I execute the command "Net stop vmms", it works, but my VM still sends the error 0x8000FFFF at start.

Do you have any idea of what I could do?

Thanks!