error when open outlook 2003

I have an annoying error when opening outlook 2003 "an extension failed to initialize, can't open file: extend.dat. the file may not exist, you may not have permission to open it, or it may open in another program. right click folder that contain file, then click Properties to check permission..."
I even try to uninstall office 2003 than reinstall but still no luck.

Any suggestion would be appreciated.
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officertangoConnect With a Mentor Author Commented:
i fixed it by deleting extend.dat and restart outlook and it is good.
officertangoAuthor Commented:
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