Outlook 2007 Upgrade from Office 2003 version.

I recently upgraded my Office 2003 version to a 2007 version. Initially
after the upgrade my Outlook 2007 did not open with a OLMAPI32.DLL "OK"
error. After running the diagnostic which did not find anything, I
uninstalled the Office 2007 version. I then could not find the Outlook 2003
version so I loaded the Office 2007 Enterprise again and was now able to
bring up Outlook 2007, but, it shows the installer each time. I then did the
repair on Office 2007 to no avail. I then tried to change the options to the
"Run from My Computer", but, found Outlook is showing "Not available". I
looked for a way to uninstall the previous version of Outlook, but, none is
shown. Any ideas? Thanks!