c# program pauses when machine is locked

Hi All,

I have a winform c# program thats on a 5 minute timer.  Once the timer counts down to zero, the program reads my outlook emails, then launches an excel object and does STUFF.

Here is the problem.  When I lock my machine, the timer still counts down, but hangs when it reaches zero.  It never launches the rest of the code.  When I log back in I see, the timer at zero, then the program continues as if nothing happened.  This is on my work pc with windows xp in a corporate environment.

Any ideas why my code hangs or how to prevent it?

Thanks,!!!