Steve,
Here is more detailed information should you need this in the future :-). Please note that activation does not fall under the support scope for WGA.
Open My Computer located on your desktop.
Go to: C:\Documents and Settings\All Users\Application Data\Microsoft\Office\Data\
NOTE: The application data file may be hidden. Use the Tools drop down menu do the following: Folder Options->View->Hidden Files and Folders->Show Hidden Files and Folders to show the folder. Please re-hide the files once you have completed all the steps.
Right click data.dat file, then click Delete.
The data.dat file is for Office, Not OGA.
Once the file has been deleted, open an Office application such as MS Word and activate it.
If product activation was successful try the Office Validation located here:
http://www.microsoft.com/genuine/office/Validate.aspx?displaylang=eng
The following Knowledge Base (KB) articles can provide more information for Office Activation issues:
KB903275 - How to troubleshoot problems that you may experience when you try to activate an Office product
http://support.microsoft.com/kb/903275/en-us
KB326851 - Activation and registration of a Microsoft product
http://support.microsoft.com/kb/326851
KB919895 - How to troubleshoot problems that you may experience when you try to activate a 2007 Office product
http://support.microsoft.com/kb/919895
KB828958 - Resources to help you activate a license in Microsoft Office programs
http://support.microsoft.com/default.aspx/kb/828958/en-us
Should you need further guidance please post your question(s) to the Windows XP General newsgroup forum located here:
http://www.microsoft.com/windowsxp/expertzone/newsgroups/reader.mspx?query=activation&dg=microsoft.public.windowsxp.general&cat=en-us-ms-winxp&lang=en&cr=US&pt=&catlist=B0DE109D-10E1-4C3C-BCC9-8EB7A22FC6A0&dglist=&ptlist=&exp=&sloc=en-us.
Hope this provides more information :-)
Stephen
Stephen Holm