See the Knowledge Base article ""Invalid product key" error message when you
start an Office 2003 program after you install Office Professional Edition
2003" at:
http://support.microsoft.com/?kbid=836178

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Hope this helps.
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Doug Robbins - Word MVP
>i install word on my desktop which no longer works so now i'm trying to
> install it on my laptop but when i put in the product key it says the key
> is
> not invalid