Try the suggestions below:
Start VAIO Care to search for a solution. See Keeping Your VAIO Computer in Optimum Condition (VAIO Care) for more information.
Restore computer system files.
Use the restore point that you created before your VAIO computer becomes unstable. See Restoring System Files Using the Restore Point when You cannot Start Windows for more information.
Uninstall an app or a driver if your VAIO computer has become unstable after you installed the app or the driver.
Reinstall the preinstalled apps or drivers on your VAIO computer if such apps or drivers have not been working properly. See How can I reinstall the original apps and drivers? for more information.
Restore your VAIO computer from a system image backup if you have created the backup. Refer to Windows Help and Support (Opening Windows Help and Support) for more information.
If the problem persists, follow the instructions in Refreshing Your VAIO Computer to reinstall the operating system.
If the problem persists after you refresh your VAIO computer, follow the instructions in Recovering from the Recovery Area to recover the computer.
The computer may not support the refresh function depending on the model you purchased.
If you have not yet created Recovery Media, create the Recovery Media. See Creating Recovery Media.
Be sure to make a backup copy of your valuable data before recovering your VAIO computer. Refer to Windows Help and Support (Opening Windows Help and Support) for more information.
Recovering your VAIO computer will delete all the data on the built-in storage device.