Every since I upgraded my macbook to Leopard OS, everytime I surf the net, my browser will auto close on me! I’d tried it with Firfox, Camino, Flock and Safari! What the hell is wrong with my installation?

I am so pissed when the browser auto closes and I had to loose all my previously typed data! And whenever I read something, it auto closes on me! How am I suppose to enjoy my surfing like that? This is sooo frustrating! Anyone got solution for me?

*A desprately needing help to solve the auto closing of browser* Claudia