A "Blocked VLK" is a Volume License Key that is valid, but was licensed solely to a corporation or larger enterprise/business. Blocked VLK's are Product Keys that Microsoft has received consent from the original owner to block usage of. A VL Product Key is non-transferrable to individuals.
In order to resolve your non-genuine licensing issue, please visit: www.microsoft.com/genuine and click on "Validate Windows". When validation fails, click on the Get Genuine button which will provide information on your options which include how to acquire a WGA Kit.
In addition, your installed copy of Microsoft Office XP Professional with FrontPage is non-genuine ( Office Status: 114 Blocked VLK ).
For more information, visit http://www.microsoft.com/genuine/ and click on Validate Office.