I assume you mean that any website you try to visit gets redirected... could be some corruption within the browser itself. Have you tried using a different browser to see if that helps? (Say, if you're using IE, have you tried Firefox? Or Netscape, or... something?)
If it's just the first page that gets redirected, just go to your internet options and change the startup page to, say, Google. But it doesn't sound like that's the issue, from what you said.
EDIT: If it is an issue with a specific browser, then you may be able to rectify the problem by reinstalling it. But don't bother until you've checked it out; otherwise, you may just be wasting your time.