Is this messege appear befor windows splash screeen?
seems like your BIOS setting s are something wrong .
what kind of PC are you use?
here is some BIOS settings tips.
http://www.pcguide.com/ref/mbsys/bios/set/
check your Boot Disk settings and hard disk settings.
If you couldn't find anything wrong,
check your Hardwares.
If this is too complicate for you,
you can bring to your local PC shop,
(If you are in USA, you can go CompUSA, BestBuy, etc., check yellowpages,
and call them to get estimate )