How to install Windows 10

Install it mostly by clicking the Next button, making sure to choose Upgrade when prompted. If you want to clean install, follow our clean install instructions instead. Note: Now that Windows 10 is released, you're going to need a valid Windows license key for 7, 8, or 8.1 in order to perform the upgrade.

1.When you first boot the computer you’ll see a screen like this one:

2.Click Next and you’ll be taken to the Install now button screen.Which obviously you should        click.

3.At this point you can choose whether you want to upgrade Windows or install a new custom      install. Since we’re recommending that everybody install into a virtual machine or on a test
   PC, you should select Custom here.

Update: You should probably choose to Upgrade the first time, because the license key might not work otherwise.

4.At this point you’ll need to pick where to install Windows 10. You might need to delete or            create a partition, but if you are using a virtual machine, you can just click Next.

5.And now it will install.

6.Once the PC reboots again, you’ll be able to select the settings like whether Windows Updates    are enabled (they aren’t allowed to be disabled in the preview). We’d recommend just using        the express settings if you are using a test machine — use Custom if you’re really going to use    the computer.

7.And now you can sign into your Microsoft account. We’d recommend using a Microsoft             account because otherwise you won’t be able to use half of the new features and you may as 
  well use Linux or stick with Windows 7.

8.If you’ve setup your account properly you’ll probably be asked to verify it in the middle. We      excluded those steps from this article, but they are pretty simple.Now you’ll be asked how to      setup the PC. Since we wanted to test everything as a new computer, we chose to set it up as a    new PC instead, but you could copy all your settings from another computer if you wanted to.

9.Want to use One Drive? It’s nicely integrated into Windows, so we just left it alone.

10.And now a colorful screen that tells us things are happening.

11.And finally, we are at the desktop! Note that the desktop on the full release of Windows 10 looks different, and this screenshot came from a pre-release version.

Now click that Start button. Click it. You know you want to.