Screwed up browsers

So I got home today and I went to check my email. I clicked on safari and it didnt do anything until a white square came up on the screen. It acted like a window, but there was nothing on it. I tried camino and it did the same thing. Firefox is my only browser that is working. I have tried to reinstall camino and that did nothing. I even tried to download and install the new version of safari, but The installer wouldnt work. I dont think that has anything to do with the browsers, but who knows. Does anyone have any idea what is going on with my computer???