Look in the program for options/preferences. If the program doesn't
offer that (most do), you can use the System Configuration Utility.
Start>Run>msconfig [enter]
This brings up the System Configuration Utility. Look on the Startup tab
and find the probable culprit. Uncheck the box next to its name, Apply
and OK out. You don't need to restart immediately, but the next time
you do you'll get a dialog saying you've used the Utility. Just tick
the box that says in effect, "don't bother me about this again".
