Safe Mode is a feature found in all versions of the Windows operating system. When you start the computer in Safe Mode, Windows loads only the drivers and devices essential for operation. Programs that normally start automatically when you boot your Sony VAIO will not load. Safe Mode is designed to allow users to troubleshoot the system. This is especially useful if your VAIO has become infected with a virus or other malicious program. In Safe Mode you can locate and remove a virus that might be difficult or impossible to remove normally.
Power on the computer or restart it if it's already on.
Tap the "F8" key repeatedly as the computer restarts. Eventually you will see the Windows Advanced Options menu.
Use the down arrow key to scroll to the entry that says Safe Mode.
Press "Enter" to resume booting Windows into Safe Mode. While you are in Safe Mode the words "Safe Mode" will be displayed in each corner of the screen.
Return to normal mode by clicking the "Start" button and selecting Restart. If the Windows Advanced Options menu appears again, use the arrow keys to scroll to Start Windows Normally and press "Enter."