I have two profiles, one for business, and one for home.  The business
one uses MS Exchange, but until a few months ago, neither profile was
on Exchange and I still had the same problem.  The problem is this:

I have the Mail Setup profile preferences set to "prompt for a profile
to be used."  Every now and then, I lose the prompt, and Outlook starts
to open to the same profile every time, even if I go back to Mail Setup
and try to open the other profile by overriding with the "always use
this profile" option.  A reboot always fixes the problem for a while.

The problem occurs on both my desktop and laptop.  Both computers use
XP pro, SP2.  The desktop uses Outlook 2003, SP 1, and the laptop SP 2.

I'm at my wit's end  with this problem, and I haven't been able to find
it in any of the knowledge bases.  I would truly appreciate some
assistance.  

Thank you in advance.