None of my messengers are opening

Hello,
none of my messgers are opening.i click on the icon n it pops up for a second then goes away. it shows up on my tool bar but when i move my cursor over it it goes aaway.
for msn ive rteid to uninstall n then reinstall ive tried to in stall a older version..wat should i do? i have msn aim skype, the only one thats workin is yahoo