To access the computer's event viewer, click on Start, then Run, then type
in: eventvwr and hit enter. When the event viewer console opens up, highlight
the Application event viewer and look for red (error) events. If there are
any related to Outlook or Office, please provide the Event ID and source.
Regarding antivirus, it's possible you may have to uninstall and then
reinstall McAfee, configuring it to not scan email. Scanning incoming and
outgoing email can really slow things down and it doesn't increase your
security at all.
Do you have any anti-spyware software scanning email? That would slow things
down as well.
Also, check for any Outlook Add Ins. (Tools > Options > Tab: Other >
Advanced Options > Add In Manager) Not all of them are compatible with
Outlook 2003 and can cause conflicts. If there are any installed, remove
them. Add them back one at a time to see if one of them "breaks" Outlook.
Let me know what happens. Good luck O'Malleys.