Interestingly, I had this issue with a PC recently. The problem was with an external device. Under the boot order the "Floppy Group Boot Priority" had "WD SES Device" listed. This told me something by "Western Digital" was plugged into the machine. Sure enough, there was a backup external hard drive plugged into the machine. Why this was listed under the Floppy Group Boot Priority I'm not sure.
I also noticed that under the HDD group priority was listed "WD My Passport". It's trying to boot from an external hard drive that has no Windows installed. I set this to the internal HDD and then unplugged the external drive. Rebooting got past that error.