If you are looking to buy a PC with Windows 7 or 8.1 on it then you’d better hurry. After October 31st, PC manufacturers will no longer be producing PCs with any other version of Windows besides Windows 10. That means that, unless there happens to be a store that has one in-stock, getting a new PC with an older version of Windows will be almost impossible.
This also includes OEM copies of Windows which can be purchased separate from a computer. After October 31st, these DVDs and license keys will no longer be manufactured and the supply will be limited to whatever your dealer has in stock. Companies with Volume Licensing for Windows 7 or 8.1 will still be able to use their license to install Windows on their corporate PCs.
It will also still be possible to use existing licenses to install fresh copies of Windows 7 on existing computers. And it will be possible, for now, to install on new systems if you have a spare license lying around. However, keep in mind that Intel has announced that, in the future, new processors will only support Windows 10.
That said, if you are on Windows 10, you may want to check out the Windows 10 Basics episodes that are part of our Computing 101 video series.