Just a quick tip to people running Windows 2008 under Proxmox/VE (I know this applies to the amd64 x86_64 version probably i386 as well) sometimes when you reboot it’ll come up and crash saying that there is no available hard disks. Then it’ll go into recovery mode and … somehow claim you have no hard disks.

Turn the VM OFF.

Wait a few seconds.

Turn the VM ON.

I had this issue after installing antivirus software in the VM, but I guess there is other things that may set it off. Anyways after a shutdown, power cycle of the VM it’ll boot back up.

That’s it!