I have a W2k machine that I can't get to update to SP4 to save my life. Every time I try, I get this rather odd message:

The file c:\program files\outlook express\msimn.exe is open or in use by another application.
Funny thing is, Outlook isn't running, and msimn.exe isn't shown as running in task manager either.

No luck in safe mode either.

Anyone run into this issue?