There are several reasons for receiving errors starting Word. This article contains the common troubleshooting steps:
http://www.mvps.org/word/FAQs/AppErrors/ProbsOpeningWord.htm
If you still encounter errors after working through the troubleshooting guide then please post in the Word Application Errors newsgroup (word.application.errors.)
Be sure to include the version of Word you are using, the patches you have installed, and what you are doing before the error occurs such as typing, opening a document, starting Word, printing, etc.
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Please post all follow-ups to the newsgroup. Email requests for assistance can not be acknowledged.
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Beth Melton
Word FAQ:
http://mvps.org/word
TechTrax:
http://mousetrax.com/techtrax/