unavailable itunes purchases already purchased

I try to play the 49 songs Ive purchased, but it says it cannot locate. It sends me to an Itunes file and Im @ another dead end. It says I only have 19 songs in Itunes store that says Ive purchased. But in my library it says Ive got those 49 song that I know Ive purchased. Im sharing this itunes with my ex whom I no long have ANY contact with. Help!