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A pop-up blocker is a utility that prevents small additional windows from opening when you visit Web pages. Some Web sites use these small windows to display helpful information, but many pop-up windows contain advertisements or offensive content. Malicious attackers also may use pop-up windows disguised as special offers to install malicious code on your computer.
Windows XP SP2 users can take advantage of the Pop-up Blocker built into Internet Explorer. Users of earlier versions of Windows can use the free MSN toolbar to block pop-up-up windows.
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