Updating old software to work with Windows 10

Each version of a new operating system comes with its own set of backwards compatibility issues and Windows 10 is no exception.
The transition from Windows 8.1 to 10 is far less jarring than the move from Windows 7 to 8 was, but there are still certain applications that can become broken and, in some cases, cease to work at all.
One such application is Chrome, which some users have even had to fully delete and reinstall. If a program isn't working with Windows 10, try looking in the Windows Store for an update and, if that doesn't work, delete and reinstall it.
Over time, more and more developers will get round to updating their programs for Windows 10 so, if you're reading this a few years from now, this likely won't be much of a problem anymore.

Avoiding inconvenient software update reboots

Windows 10 is, in many ways, a truly internet-based operating system. Mostly, this is a bonus but there are times when it isn't – and Microsoft's attitude towards operating system updates is one such time.
The most annoying part of automatic updates is the restarting, which can seemingly come at random (and inconvenient times). The simplest way to counteract this is head to Windows Update (in Settings > Update & Security), click on Advanced Options and then Notify to Schedule Restart, which means the OS will request a reboot rather than trampling all over the work you're not quite done with yet.

Activating Windows 10

Some users have reported issues with activating their copies of Windows 10, which could have been down to a number of different reasons. In some cases, the easiest way to get around the problem is to purchase a legitimate copy of Windows 10.
Unlike previous versions of Windows, the latest one is almost exclusively available online, which means that official Microsoft websites are the best bet for your purchase. The company was giving the OS away for free, but that promotion has now ended.
Microsoft has a helpful website that provides a downloadable copy in either 32-bit or 64-bit versions.
If you do find that you're unable to activate Windows 10 successfully, handily Microsoft introduced a new activation troubleshooter feature with the recent Anniversary Update. You'll find this in Settings, then click Update & Security, go to Activation and select Troubleshoot (you won't see this option if the OS has been activated).