The Office Open XML file Building Blocks.dotx cannot be opened because there are problems with contents

I had a real problem with B2 Technical Refresh of Office 2007 not allowing me to insert page numbers, giving me the error message "The Office Open XML file Building Blocks.dotx cannot be opened because there are problems with contents."

Thanks to "PJ-DJ" I found the answer here:
http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=932036&SiteID=17

Step 1: Close Word and Outlook if you are using Word as your email editor.
Step 2: Go to C:\Documents and Settings\(Username)\Application Data\Microsoft\Document Building Blocks\1033 and delete the Building Blocks.dotx file.
Step 3: Open Word. CLOSE IT AGAIN. Wait a few seconds.
Step 4: Open Word. On a blank document, Insert Page Numbers. Check your C:\Documents and Settings\(Username)\Application Data\Microsoft\Document Building Blocks\1033 folder. A new Building Blocks.dotx file should have been created.
Step 5: There is no Step 5. You should be fine now.

I really must get that licensed copy of Office 2007 installed - But I'm not sure if Sharepoint designer is released?