Assuming your bb and cranks are spec'd for on another I would do the following [ if you can't do it, have your LBS do it ]:
#1 Look at your farme and make sure there are no cracks in it near the bb welds
#2 Remove your cranks and then remove your bb.
#3 Clean and grease your frame's bb shell.
#4 Put teflon/plumbers tape on your bb cups, then reinstall them [ tighten to spec ].
#5 Reinsatll your cranks [ tighten to spec ]. Also make sure that all your chainring bolts are tight.
#6 Remove your pedals, grease the threads and reinstall your pedals.