Sudden "No Operating System" message

Hi. I had a fatal crash of the VM. When I tried to restart Parallels using the .HDD file, I got a drop-down message that says:

"There is no operating system installed in the virtual machine."

Luckily, I back up my .HDD drive each day. I went to yesterday's back up. Same message.
I went to the previous backup. Same message.

Each of these HDD files have Windows XP as the OS, so I don't understand why I would be getting the message. I don't have the OS disks anymore.

Detailed message attached.

 

I suppose you need to try http://kb.parallels.com/en/4680