Norton Email error 421 is a runtime error; Runtime error is exceptionally disturbing particularly when you are in the center of something significant. Runtime error happens in Norton antivirus as well and it is expected to misusing of gadgets and Norton antivirus programming. Runtime Error can further influence your information and gadgets if not taken care of at the ideal time. Norton antivirus additionally faces the issue of such mistakes if there is an issue of misusing with the Norton antivirus programming. One such runtime mistake is Norton 8506 error 421 and this post will help you in fixing the Norton error 421 in your Norton Antivirus.

What is Norton Error 421?

Norton Error 421 is a kind of runtime error which more often than not happens in the Norton antivirus. This Norton error code 421 Occurs during the program or Software installation in a gadget when the Norton antivirus program is running at the background. The Norton error 421 4.7.0 could occur during the Windows startup or shut down process. It is very important to report the Norton error 421 immediately as this may further damage the system performance.

What are the symptoms of Norton error 421?

Your active program window crashes and you will get display message 421
Some other software programs might crash your system with error 421
Norton antivirus error 421 messages displayed on the screen
Your windows performance speed is reduced, especially with input devices like mouse or keyboard
Computer hangs or gets freeze frequently

What are the causes of Norton antivirus error 421?

Incomplete or corrupt installation of Norton antivirus program
Damaged or corrupted windows registry entries related to Norton antivirus software
Any virus or malware attack may damage Windows system files
Some another software program might have deleted Norton antivirus related file
Error 421 can be due to a variety of factors and it is vital to find out the instances of this error for troubleshooting

Full malware scan of your system

Error 421 is maybe because of malware infection or virus attack on the system. So complete scanning of your system is very important. So it is recommended to conduct a full malware scan of your system.

Cleaning of the system junk

Our system starts accumulating a large number of junk files due to web surfing and other computer work. Cleaning of these junk files is very important and for good system performance. This junk may also slow down the Norton antivirus system. You can take the help of the Windows Disk cleanup tool like Winsweeper. This tool is developed by Microsoft gold partner. Windows in the built tool that is “cleanmgr” can be also used to clear the junk files.

Open the command prompt and type the command “cleanmgr”. This will start automatic calculating of junk files with a dialog box, select the temporary files.

Update PC device drivers

Norton antivirus error 8506 and 421 could be due to outdated device drivers or damaged device drivers. It is always recommended to update the device drivers with the latest versions. Manually updating device drivers can be a tricky task. You can use tools like driver update tool or driver doc. These tools will automatically update the device drivers also take the backup of old drivers. Driver doc tool is one click update tool developed by Microsoft gold partner. At any point in time, you can roll back your drivers to previous versions.

Reinstall the Norton antivirus

Go to the control panel and open the programs and features. Select the Norton antivirus instance and hit the uninstall button. Follow the instruction to uninstall the Norton antivirus software program. After the process completes, restart the computer system.

Windows latest updates

Check your internet connection and update the windows with the latest updates.

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John M. Norton

Technical Expert at Norton Support Center

John M. Norton, is a technical expert and love to solve things. John writes and shares his technical knowledge with Norton Support Center regularly. He is a frequent blogger who keeps a tab on the latest updates in Security and technology arena. You can reach him at Mail | Facebook | Twitter | LinkedIn

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