Hi,
We have an official article regarding basic troubleshooting steps to fix Outlook not starting.
Please refer to:
I can’t start Microsoft Outlook
By the way, Outlook 2007 is an earlier version which may easily cause some incompatible issue.
Since support for Outlook 2007 has ended on October 10, 2017. Microsoft will not provide support for Outlook 2007, including security patches, non-security hot fixes, and incident/assisted support. It is recommended to upgrade to newer version of Office
to get better support and user experience.
Thanks for your understanding!
Regards,
Perry
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