How do you replace slipped drive belt on Poulan Pro?

To replace a slipped drive belt on a Poulan Pro lawn mower, first disconnect the spark plug wire for safety. Remove the deck or any covers obstructing access to the belt. Then, carefully remove the old belt from the pulleys, and install the new belt by threading it through the appropriate pulleys according to the mower's belt routing diagram. Finally, reassemble any removed parts and reconnect the spark plug wire before testing the mower.