Browser opens never-ending chain of tabs when I click on send mail to

New to W7 user. When I'm on a page that has a response button or active web mail address, if I click on the button, my browser starts opening tabs one after another at a very high velocity. Hundreds of them, perhaps thousands if I didn't intervene, the tabs that DEVOURED CLEVELAND! This happens on IE8, Firefox9, so I'm assuming any browser. My computer is new and I'm new to W7 (64bit?) & no I don't have my finger lounging on the keyboard. The only way to stop the process is to hold down the pause/break key. But only while you're holding it down. If you let up it goes right on propagating. So exiting the web page is the only method to stop it. Any suggestions that don't involve latex gloves?

Your infected with a Virus and or Malware. Run a full scan of your AV, what ever flavor your using. Most of us prefer MSE.

Microsoft Security Essentials - Free Antivirus for Windows

I've got Norton Internet Security running, I ran MS Security and both show no infections. Any other suggestions?