ARGH WTF! Tech help, please?

[effervescible]

Can anyone tell me why Internet Explorer has suddenly decided to error every time I start it? I keep getting the "not responding" thing and it shuts down. And Semagic's doing the same thing! God knows what other program might. I wasn't even DOING anything at the time it started, just playing City of Heroes! I beg you guys, PLEASE help me figure out wtf to do about this.