I'm sorry about the issue. Please click on Start -> All programs -> Windows Update, then check for windows updates there, then install Windows 10, if it shows there.
If that does not work, click on Start, then right-click on Computer, then click on Properties, then check if your System type: is 32-bit or 64-bit
, then download / install Windows 10 at the website below:
, there, scroll down, then click on the appropriate version to download, then install it.
Please reply at the box below to continue troubleshooting. Thank you.