How did you 'delete' the demo. Did you uninstall it or just delete the
files?
Either way it appears you may have an unwanted registry entry - see
http://www.gmayor.com/Toolbars_in_word_2007.htm

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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> I deleted a demo of Word 2007 now when I open Word 2003 Windows
> Installer pops up and stops the program from opening immediately.
> This is annoying as Installer takes a long time. How can I fix this?