Try this:
Dealing with Unwanted Spyware, Parasites, Toolbars and
Search Engines
http://mvps.org/winhelp2002/unwanted.htm
>-----Original Message-----
>When I browse the internet, I started getting a "connect
>to" sign on screen for the adservers on websites. It is
>the standard signon screen asking for "User Name"
>& "Password", but I don't have one to the ad companies.
>I get this for "ad.doubleclick.net",
>"global.msads.net", "ad.zedo.net", "servedby.advertising.
c
>om", "adfarm.mediaplex.com", and others.
>I have not changed my security settings. I have run
>AdAware & SpyBot & McAfee virusscan-- they show nothing
>unusual. I have not loaded new apps.
>But it is a PAIN to click "cancel" everytime the web
page
>changes.
>How do I get rid of this?
>Thanks for anyone's help since the ad companies won't
>help me (they won't even talk to me) and Microsoft has
no
>email or online support for IE6.
>.
>