There are many Sony Vaio laptop models. Look up your specific one on the Sony support site and see if there are Windows 7 drivers for it. If they are, it will run Windows 7. If there are not, it may still run it but you would need to do some searching to get everything working. In that case I don't suggest you change anything as you may never get things like audio and full video drivers working. If you are upgrading you may as well get Windows 10, it is current, cost is no different than a new copy of Win 7 would be. Driver check for that also applies