My blade belt is worn out on my Murray 42" lawn mower. The belt had fallen off the guides(pullies). I removed the belt, copied down the mower model # and got the appropriate belt but, I'm not sure how to put the belt back on. It's too loose and a wire spring came loose from the center pully guide. It's an older mower given to me.

Hi,
You may want to download a manual for your mower at:
OwnerIQ: Product user manuals, help, forums tips and tutorials. (http://owneriq.net/)
Joining is free and manuals on many things. As far as your machine; pick Lawn & Garden, Murray, Lawn Mower and one starting with the deck size, i.e. 42.