Help me w/computer probs. please

I'm not too computer literate but can someone tell me why when browsing the net and I click on something all of a sudden hundreds of pages flash in succession in seconds. Is this a virus? How can I permanently stop this. I have to completely shut the computer down and restart, then it's ok for awhile then will resort to this problem again and again. I have DSL recently from years of dial up. I didn't have this prob. w/dial up too much.
Also, anyone no of a good download to permanently stop all annoying pop ups. I have a pop up blocker but I still get stupid pop ups? Tweet