What happened prior to cause your notification?
If your copy of Windows fails validation, you will receive notifications in the lower portion of your desktop that indicates your copy of Windows did not pass genuine validation. You can click the notification or click the WGA icon in the notification area to open the Windows Genuine Advantage Validation Failure Web page. This Web page gives you the specifics of the validation failure and the steps that you can take to make the operating system genuine.
The persistent notification is an image that floats above the lower-right corner of the desktop. If your copy of Windows is not genuine, a persistent notification will appear below any active window to indicate that your copy of Windows did not pass genuine validation. You may interact with any icons that appear to be under the persistent notification. However, it cannot be hidden with objects on the desktop.
If your copy of Windows fails validation, the desktop will also be set to a plain black background. You may reset the background to a wallpaper or to another background color, but the desktop will be reset to a plain black color every 60 minutes, until your copy of Windows passes validation.
Every time that a notification appears, you can choose to receive detailed information about the specific validation failure. The information includes the steps that you can take to resolve the problem.
With that being said, It now becomes a Grey area on where members here in this forum will take this
You can create rules for specific WGA related files, which will stop the nagging. But unfortunately this will not solve your problem of being able to update from Microsoft.
You can remove the annoyances, Google for removal.
Get your updates from here