Microsoft Office 2008 Invalid Product Key (PID)

Hey all, i have just updated my Office for Mac Software which said that the update was "critical".
After re-starting my Mac and clicking in MS Word the message reads: "Office for Mac has determined that your product key is invalid". My product key is Genuine as i am one of three registered users after purchasing the Student and Teacher version. I cannot open any Office files and am furious to be honest that this can happen!
I have followed the following help on Mactopia but still cannot find these lines for putting into Trash: Can you please help me on this issue?
If your copy of Office 2008 was installed with an invalid product key, or if you mistakenly used the same product key to install Office 2008 on more than one computer, you must remove the invalid product key and enter a valid product key to use Office 2008.
In the Finder, select *_/Applications/Microsoft Office 2008/Office/OfficePID.plist_*, and then on the File menu, click Move to Trash.
Select *_/Users/username/Library/Preferences/Microsoft/Office 2008/Microsoft Office 2008 settings.plist*_, and then on the File menu, click Move to Trash.
On the Apple menu, click Restart.
After your computer restarts, open any Office 2008 application.
The Office Setup Assistant opens.
Accept the software license agreement, and then enter your valid product key.
The product key is located on the back of the Office 2008 for Mac DVD sleeve or on the back of the Install Guide.
Thank you in advance for your help and time!!!!!
Dave
Message was edited by: buddawave
Message was edited by: buddawave

This forum is for troubleshooting Apple Software Update for Windows, a software package for Windows designed to update Apple products that run on Windows, and not related to Microsoft Office. Please post Office related questions on Microsoft's own forums for their Mac products.
http://www.officeformac.com/productforums

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Reference:
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Message was edited by: nerowolfe

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Hi there,
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Hello
if is for test you don't need to uninstall Microsoft 2008 , just install both
disk intallation can be used many time with out any problem , the licence to use software is one per computer , you need to keep safe your installation key come from software pakage
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THT
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