don't restore file *.vhd by Windows Server backup on Windows Server 2008

I use Windows Server Backup backup volume C on Window server 2008. I use disk install to restore but when on System Recovery Image don't see file *.vhd.

I reference on internet and i have use:

Diskpart

select vdisk file="C:\backup\backup.vhd" but it reported:

DISK - shift a the focus ...... disk

Volume - shift a the focus ...... volume

................ --> not success

Now, i cant Restores Volume C, it is volume install OS... please help me... it very very bad