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Try this link for further information in recovering the factory installed Windows 7 OS from your recovery partition.
How to Recover Factory Settings on Sony Vaio Computer with Windows 7
You have mentioned that there is no recovery partition on your hard disk. Can you post a image of your disk management showing partitions?
Your Vaio should have 3 buttons just above the keyboard on the top right. They should be labeled Assist, Web, and Vaio. If you have the Assist button: with the computer turned off, click the Assist button once and that should automatically start the computer and open the Sony/Vaio Recovery Wizard. From there you can follow the prompts to access the hidden recovery partition, make recovery disks, perform troubleshooting steps, etc.