Sometimes an installation program requests that you disable your antivirus software. The reason is that the antivirus software has difficultly determining whether the program you’re installing is a legitimate program or perhaps a virus taking roost in your PC’s storage system.
As long as you purchase software in a store or download it from a reputable site on the Internet, you can safely install the thing. To disable your antivirus software, locate its icon in the notification area on the taskbar (usually in the lower right corner of the desktop). Right-click the icon and choose the option to disable or exit the program.
Disable your antivirus program only when installing new programs. If you downloaded those programs from the Internet, ensure that they’re from a reputable source.
After installing the software, re-enable the antivirus software. In fact, it might even be a good idea to restart your PC at that point; by restarting, you ensure that the computer is scanned for new infections and that the antivirus software starts up as it should.
Never disable the antivirus software when you don’t expect anything to be installed or when you’re prompted to do so by a website or an email message.
At times, legitimate software has been shipped from the developer with a virus lurking on the disc. Those times are extremely rare, however, and if you subscribe to an antivirus update service, you’re alerted to these infected discs almost immediately.
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Source:http://www.dummies.com/how-to/content/when-and-how-to-disable-antivirus-software.html
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