Pop up ads are of three different categories namely pop-ups created by spyware and adware, messengers service advertisement and general browser pop-ups. Pop-ups ads occasionally appear on the screen and interfere with the user s ability to view the contents displayed on the screen. The user can easily avoid these advertisements by installing a pop-up blocker.

Messenger service advertisement:These types of pop-ups are applicable only for Windows XP and Windows 2000. They usually occur because someone is accessible to your computer network and is can transmit this message to your computer through TCP and UDP ports. It is the responsibility of the messenger service to transmit these messages. For controlling these pop-ups, the security has to be hardened by installing firewall software like zone alarm or by installing Windows XP which puts off messenger service by default and activates the windows firewall. The port which facilitates the transmission of these messages gets blocked.

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