Can't download purchased apps

I synced my iPad with my pc to update my iTunes. When I connected the system it prompted an update for the iPad os. I let it do the update and it took a long time to get stuff back and asked me if I wanted to back up to the cloud. I let it back up that way and then eventually figured out how to bring up my purchased apps. Not all of them reappeared and at least four of them are stalled in the "installing" mode. I cannot Netflix or imdb reinstalled as well as some others. Does anyone know what I am doing wrong?