- Press window key from keyboard
- Enter add features in the search box, and then tap or click Settings .
- Tap or click Add features to Windows 8 and then do one of the following:
- If you need to purchase a product key, tap or click I want to buy a product key online.
- You will be prompted through the steps to buy a product key from there and it will be entered for you.
- If you already have a product key, tap or click I already have a product key.
- Enter your product key and click Next.
It will install feature, Be Patient, This will cause sudden restart so before performing add feature save your all important work.