(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?
(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.
John,
Couple of linked articles below seem to be the same issue?
Primavera P6 Excel Import/Export Require Microsoft Access [Solved] - Planning Engineer Est.
Error: Excel Import/Export features require Microsoft Access Database Engine (prmyazilim.com)