Twirly thing under the vacuum has stopped spinning

there is a belt that drives the beater brush. flip the unit over, you can remove the bottom cover by removing a couple of screws. to one side of the brush you will see a channel where the belt should be. go to you local walmart, sears or hardware store and in the vaccume section they will have belts, on each bag of belts will be a list of vaccumes that belt fits simply find yours. with the new belt simply lift the beater brush out at the belt channel side and install the belt around motor shaft and brush. then place brush back in place , be suer brush guides are in properly. this should do ya.