VAIO users have been warned against updating their laptops to Windows 10 for the time being. Sony is still testing drivers for the new operating system, and it is not yet ready to offer support for the older machines.
While Sony sold off the VAIO division to a Japanese investment firm back in 2014, it has promised to provide technical support for users who are still using the laptops. However, this arrangement appears to mean that it is not their top priority and work to provide new drivers has been slow.
There is a schedule for when the new drivers will be pushed out, and VAIO users are advised to bookmark the website and check back regularly to see if the new drivers are ready. That being said, it appears that Sony will not be ready to push out the new until October; and then it will only be ready for VAIO machines that shipped with Windows 8.1 pre-installed. Other VAIO laptops will have a longer wait.
Windows 10 is a being released as a free upgrade, albeit with some restrictions. Most computer users who are running on Windows 7, 8, and 8.1 qualify for the upgrade, although Microsoft is rolling it out in stages. The number of VAIO still in use is unknown; but those running on one should make a note to wait until Sony says it is safe to upgrade.