From your Windows 7 computer, visit Microsoft's website and download the Windows 10 installation media tool by selecting 'Download tool now.' In it is a 25-character code that looks like this, with numbers and letters: 'Product Key: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX.' Keep that somewhere safe, because you'll need it soon. Microsoft will send you a confirmation email after your purchase.I recommend just buying it before you get started so you don't run into any problems.) (CNET says Microsoft is still letting people upgrade for free, even though the free upgrade program ended in 2016, which means you might be asked to pay. Buy Windows 10 from Microsoft's website.If you're happy with the speed and battery life of your current computer, though, you might be good to upgrade the computer you already have to Windows 10.

All have the latest Intel chip and should last you a few years. Three Windows 10 laptops I'd recommend you check out are the Dell XPS 13 2-in-1, Lenovo Yoga C940 and 13-inch HP Spectre X360.

Microsoft will warn you that Windows 10 won't improve speed, battery life or performance, so if any of those are current issues you should buy a new computer with Windows 10 and skip the upgrade, which might just make your computer more sluggish.

It will ask you how fast your computer feels now, how long the battery typically lasts, how many programs are able to run at the same time, and how important security is for you. Microsoft has a short quiz on its website that will help you confirm that Windows 10 will run properly on your current computer.

Next, you want to make sure that your computer is capable of running Windows 10.

Find out what version of Windows you're running by opening the Start menu, choosing 'Settings,' selecting 'System' and then choosing 'About.' If you see Windows 7, it's time to upgrade.

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