Try tapping the F8 key at bootup, on Advanced Boot Tools menu select Repair My Computer.
See if Factory Recovery option still exists.
If not, go to Sony Support Downloads website for your country, read the Manual for your model to see how Factory Recovery from HD is done. You can also order Disks there if you don't have them, although they will contain all the sponsored bloatware which comes pre-installed.
if you have access to a Windows 7 installer and want a superior clean reinstall using Product key on your COA sticker, follow these steps: re-install windows 7