Are there any disc's in Vaio's CD/DVD tray, if so remove from the drive..
Normally restarting your vaio and pressing the F10 key when you see the Vaio logo should start the recovery process using the hidden HDD recovery partition..
Does anything happen when you press the F10 key repeatedly when you see the Vaio logo.?
If you are unable to start the recovery using the F10 method above then the hidden HDD recovery partition may be damaged or have been corrupted & unless you created a set of recovery disc's you have two options..
1, Contact vaio support to purchase a set of recovery disc's, you could ask them to try and troubleshoot before committing to purchasing a set of recovery discs.. Purchasing a set of recovery disc's is the only way you'll be able to re-install the original supplied OS & pre-installed applications, etc.
or
2, Install a fresh version of Windows & then install the drivers & utilities from the Vaio support site, obviously you'll be without the pre-installed applications..