Possible effect of aborted installation?

When I bought a new computer my old Office 2003 disks would not install;
apparently I had already installed it on the maximum number of
computers. But I did successfully install an older version, Office
2002. The I bought new disks for Office 2007 and installed that
successfully.

However, Reminder windows continually appeared, showing messages, which
had not happened in my earlier installed versions of Outlook. Not
knowing that it's normal for flagged messages to be shown in a Reminder
window, I thought this was due to some systemic problem of corrupted
files, etc. So I uninstalled Office and then manually altered the name
of the remaining Outlook data folders and the files in those two folder,
in the paths: 1) documents and settings / user / application data /
microsoft / office / outlook; and 2) documents and settings / user /
local settings /application data / microsoft / office / outlook.

Then I attempted to reinstall Office, but it seemed to stall and not
make progress, so I aborted that re-installation. Then I manually
changed the folder and file names back to the original forms, as much as
I was able to do. After that, I successfully re-installed Office 2007,
without undue delay.

MS-Word 2007 works well now, but when I try to open Outlook 2007 an
error message appears saying it can't find a data file, and tells me to
configure a data file through Control Panel / Mail icon. When I attempt
either 1) to select the default Outlook personal folder PST file under
documents and settings / user / local settings / application data /
microsoft / office /outlook OR 2) to select another old PST file
(created in Office 2003) which is held in a different folder elsewhere
on the drive, an error message appears saying "This information service
is not installed on your computer". The Mail icon does permit me to
create a profile and an email account, which can link to my ISP, but
doesn't permit me to configure a data file.

What should I do about this? Uninstall and reinstall all of Office? Is
there any other solution?

Thomas