To add a bit to John's reply -- see:
http://project.mvps.org/posting.htm
Adding a bit to Dave's reply -- do you have calculation set to
manual? If so, you may see the "Calculating" message appear longer
than those with automatic calculation set. I suggest checking you
calculation setting in Tools > Options.
I hope this helps. Let us know how you get along.
Julie
Project MVP
Visit
http://project.mvps.org/ for the FAQs and additional
information about Microsoft Project