How do I restore original factory settings after installing Windows 8 ?

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I installed windows 8 nut things are not working properly. I would like to shift back to windows 7 on my Sony Vaio. But how do I restore original factory settings ? I cannot find the 'Vaio central' option in the start menu.

By installing Windows 8 Dev Prev over your original operating system do you realise that without a full backup will not be able to do restore?
You can however reinstall the previous OS if a restoration disc is available to you and install all software from there.
Long way but unless you have created a dual boot.
This is not the expected reply but sorry.

I am not sure I understood your problem but, have you tried F11 (or F10 at some cases) while booting? Sometimes it brings up a menu to restore your built-in OS that is hidden on a special partition...

You should have installed W8 on a different partition since it is not a final version. Only final versions should be installed on other Windows, just in case to lessen the risk. I hope I helped you dude!

Also look for a folder called Windows.old on your hard drive, that should have your old install of Windows and will have your old data. Make sure to copy that somewhere safely before wiping the drive.