Can't installed windows 7 ultimate or other version on sony svf 154b17w.

[mcban]

I have sony svf 154b17w pre installed windows 8 but i want to uninstall & use windows 7 instead. I've tried to install windows 7 choosing "legacy" BIOS option. I have deleted all the drives even the recovery partition because i don't like windows 8. I have successfully installed windows 7. Finally i've done installing and provide the PC's name, but unexpectedly after restarting it shows "operating system not found".
Can you solve it ASAP ?

 

[MrTuRtLe03]

Check your boot sequence in the BIOS, something may have been out of order. Move your HDD (or wherever you installed the OS) to the top choice and it will boot to that.