Boot manager will boot to a disk if there is one in there. Did you set up a recovery disk on the hard drive? If so, then you need to hit F8 during boot, and select boot to disk (that is the windows disk it is asking for). That will then ask if you wish to repair or recover. If your recovery is on the hard disk, this is how you get to it. It you have no WINDOWS operating system disk to spin and boot from, we need to know what OS.