ie going crazy

hi everyone.i need some help.my problem is this: i can be on the computer doing anything, playing a game checking e-mail etc and BAM an internet site called speed monitor mostly, comes up but i have also gotten e-bay and other various sites. thank God no *** sites yet. anyone know what this is. i ran avg virus check and it did not see any. is this malware spyware or what? it took me 5 minutes to type this because of the sites popping up. i am not a fast typer it would have taken me 3 minutes normally. any help will be greatly appreciated. thanks