"Your activation period has expired"

When you launch Windows Vista, you might accept the following error message:
Activate Windows now your activation period has expired and Windows is no longer working. To make use of Windows you have to make active this copy of Windows.

As well, the taskbar does not emerge. You have restricted access to Windows Vista programs and features.

This trouble might happen for one or more of the following reasons:

• You did not activate Windows Vista in the 30-day activation time.

• Windows Vista identify that the hardware on your PC has been changed extensively and this occur because you did not activated your Windows Vista in the 3-day grace period for re-activation.

• You are using a edition of Windows Vista that was identified as a invalid. For more information, see the "Resolution" section.

You think that you have a Windows valid benefit copy of Windows Vista, use these methods to troubleshoot the issue.

Kindly Note:

The Windows Genuine Advantage (WGA) program and the Office Genuine Advantage (OGA) program are part a Microsoft attempt to defend its clients and associates from fake software as well as raise consumer alertness of the importance of valid Microsoft software.