Sorry that it has not worked out so far.
Go to search type cmd
In cmd type
slmgr /dlv
It will take about 15 seconds to see the results. Toward the bottom license status.
Since you have an OEM version of Windows (came preinstalled) you will have to contact the computer manufacturer, in lieu of Microsoft, with the results of your verification, if you are not licensed.
But lets get the results before we go there.