Hi Cedric,
Usually this error message occurs if in the BIOS(Basic Input Output System), booting is set as to start from CD Rom or floppy drive as first boot device. Where as you are trying to boot from the Hard disk.
Go into BIOS and change the Drive Boot Order so that the Hard Drive comes first as a boot priority. You should be able to boot into Windows normally after you save it to that configuration.
You need to contact your computer manufacturer in order to change the boot priority in BIOS( Basic Input Output System).
Warning: Be careful when changing BIOS settings. The BIOS interface is designed for advanced users, and it's possible to change a setting that could prevent your computer from starting correctly. Updating BIOS should only be done if necessary (to solve a compatibility problem, for example). It can be a complicated process, and if an error occurs, your computer could be rendered inoperable. Be sure to follow the manufacturer's instructions exactly.
If you need any further assistance with Windows Operating System, please post your query on Microsoft Community Forums and we’ll be glad to assist you with it.