Please try the good advice given by passwordreset but if nothing there helps, you can reset the Vaio to factory settings by tapping F10 during boot - when you see the Vaio splash screen.

If you want some guidance on how to do this, either look at the Recovery Guide on the support page for your model or tell us the Vaio model so we can give you a link.

The easy way is to reset Windows 7 password. No need to reinstall the whole operating system and software installed on your computer. Check out this guide:

http://www.top-password.com/knowledge/reset-windows-7-password.html

It should be helpful for you.

Good luck!