sumdumguy is right. Get yourself a copy of spybot, search & destroy, update its database, run it and click on immunize.
Dialers are illegal in most countries, so chances are this isn't anything legal. Get rid of it asap.
I suggest you also get a more secure browser, or, if you're keen on using IE, increase the security settings. Those things can seriously slow down your computer's performance and download all sort of stuff to your hd.