When you are browsing the internet and suddenly a window pop up with different messages for example” free update for your computer “,”scan your computer with free anti virus”. May be some pop-ups messages helpful for you but you should read first in detail before clicking it. Pop-ups basically an advertiser message or unwanted program and website that might be disturb your computer performance.
If you are working with Internet Explorer and want to block the pop-ups windows and unwanted messages. Open the Internet Explorer and click on Tools menu and go to Pop-up Blocker option, here you can Turn Off Pop-up Blocker to block pop-up from all websites. But you have option to allow some websites for pop-up. For this purpose open the Pop-up Blocker Setting. Here you can add some specific websites name to allow for pop-up and click Add. If you feel any problem to block any pop-up message due to some problem, simply click on the X at the right top of the pop-up windows.