If you absolutely don't want Windows 10 on your PC, it's work to take notice of the fact that Microsoft is going to make it harder to prevent the update. At present updating to Windows 10 is an opt-in process, but from early 2016 the update to Windows 10 will be added to the list of automatically downloaded (and installed) updates that are retrieved from the Windows Update service. The installation of Windows 10 will still require a bit of interaction though, as you need to accept the license agreement and so on.
We will soon be publishing Windows 10 as an “Optional Update” in Windows Update for all Windows 7 and Windows 8.1 customers. Windows Update is the trusted, logical location for our most important updates, and adding Windows 10 here is another way we will make it easy for you to find your upgrade.
Early next year, we expect to be re-categorizing Windows 10 as a “Recommended Update”. Depending upon your Windows Update settings, this may cause the upgrade process to automatically initiate on your device. Before the upgrade changes the OS of your device, you will be clearly prompted to choose whether or not to continue. And of course, if you choose to upgrade (our recommendation!), then you will have 31 days to roll back to your previous Windows version if you don’t love it.
If you are on a metered connection on Windows 7 or Windows 8.1, then you have the option of turning off automatic updates. We strongly discourage this in today’s connected world because of the constant risk of internet threats. If you choose to do so, we recommend manually checking Windows Update frequently, perhaps when you are on a non-metered network and consider the installation of all “Recommended” and “Important” updates. Windows 10 will not automatically download updates on a metered connection unless there is a security issue addressed within the update. In addition, Windows 10 contains a number of features for those on metered connections, including monitoring data usage by application and setting data usage quotas.