Norton Antivirus, released by Symantec, is subscription software that provides protection against viruses in downloaded files, e-mails, Web pages and even in external hard drives and flash drives. In fact, because this program handles virus protection on so many levels, it can run into trouble when being loaded and used on operating systems such as Windows Vista which have their own limited protection devices.
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Antivirus in Use
One of the most common problems experienced by Vista users with Norton Antivirus is a slowdown in all of the computer's operations from start-up to Web browsing and file transfer. Often, this is because of automatic protection procedures contained in both Norton Antivirus and other antivirus programs embedded with the Windows Vista software. Because both of these programs are automatically activated while using Windows Vista, both programs are scanning each function being performed by the computer for unwanted or unauthorised program activity. Remedy this problem by first selecting "Start" and the "Control Panel" in the start menu. Once in the "Control Panel" select "Programs" and "Uninstall a Program." From here, find any unwanted third-party antivirus software and remove it from the system.
Missing Tray Icon
Occasionally after updates, the Norton tray icon may go missing. Before further action try restarting the computer. If the computer is missing the tray icon after restart, download and run the Norton Hotfix Tool. Use the tool by saving the file "KB20100122121538EN" to the computer from US.Norton.com and then double-clicking on it. A security window will pop up asking whether you are sure you want to proceed. Click "Yes" and follow the prompt to complete the hot fix. When finished running the program, restart the computer and attempt to activate Norton Antivirus. The tray icon should appear and remain when the antivirus control centre window is closed.
Although it is rare, the error 8504,104 may appear on computers using Windows Vista or Windows 7. If this should happen to you, click the "Start" button and enter the "Control Panel." Once in the control panel, click "Turn User Account Control On or Off." In this menu, uncheck the option "Use User Account Control (UAC) to help protect your computer." Once this operation is complete, close all programs and windows and restart the computer. Once the computer has restarted, the error message should not persist.
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