Since I installed Outlook 2010 on a new machine (WinXP Pro SP3) a couple months back I have had an issue that is quite annoying: If I close Outlook then attempt to restart it I get a small pop-up saying only: "Cannot start Microsoft Outlook". I found one workaround, but not a terribly practical one: reboot. If I reboot then launch Outlook, it opens fine.

Here is what I know:

• Since I can run Outlook just fine after a reboot, I do not see that a system restore, an OS reinstall, or the like would help.
• I tried "outlook.exe /resetnavpane" and "outlook.exe /safe" but those give the same error.
• There are no entries in the event log.
• There is no instance of Outlook appearing in the process list once I close the program, so it does not seem to be an alias for "outlook is already running".

As far as I have found, my situation is unique among reports of similar incidents: I have uncovered no other reports saying Outlook would run fine the first launch or that a reboot would again allow it to run.

Suggestions?