Unwanted Web Pages keep opening up on IE

Hi guys,
don't know what I have done but, web pages keep opening up when I haven't
clicked a link. When I am on my computer not on IE, web pages keep opening
up, the main ones are http://ad.yeildmanager.com and www.screensavers.com
how do I get rid of them. I have ad aware and spybot s&d, but do not seem
to stop them, your help is appreciated
Thanks and Regards
Bob


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