wheres my yahoo mail and other stuff?

first exployer disappeared,i was only aable to find and put the icon at the bottom of the screen,my weather gadget wont show on the page, when I try to load it ,it only comesup an x,,also on my yahoo home page ,the advertisement don't show, and my mail doesn't go through, the yahoo page shows it is loaded, when I click mail , it takes me there, but nothing is in it, to read my replys ,ill have to go on someone else es computer, please help have window7 never had this problem b4