for the first bolt, you'll need the appropriate size easy-out. (you drill a hole in the bolt, and use a bolt extractor to remove it (kinda like a dull drillbit looking thing)
as for the other one, craftsman makes some NIFTY stripped screw extractor bits. (hex shanked bits that have a sharp v point that digs into the screw as you push and turn it loose. (by hand is best)