Exact steps to Norton Error 421:

Norton antivirus is the best antivirus to safeguard your device. It sometimes gets you stuck with Error code 421. Below given are the steps to troubleshoot this error. It is advisable to make sure that you are using string and stable internet connection.

First of all, conduct a malware scan of your system because there is a possibility that this error code occurs due to malware infection or virus attack on the system. So, it is suggested to conduct a complete malware scan of your PC and then, clean the system junk.


The system starts by accumulating a large number of junk files because of web surfing and other computer work. Cleaning of these junk files is very essential and for excellent system performance. This junk might also slow down the Norton system. You can do with the help of the Windows Disk cleanup tool ‘cleanmgr’. Open the command prompt and then type ‘cleanmgr’. It will start automatic estimating of junk files, select the temporary files.

Update device drivers of PC:

Norton error 421 might occur due to outdate device drivers or corrupted device drivers. It is advisable to update the device drives with the updated versions. You can use tools like driver update tool or driver doc. These tools will update the device drivers automatically. Driver Doc tool is one click update tool and is specifically developed by Microsoft Gold partner.

Reinstall the Norton antivirus:

Go to the control panel and open the programs and features. Select the Norton antivirus instance and hit the Uninstall option. Follow the on-screen instruction to uninstall the Norton and when the process completes, restart the computer system.

By following these simple steps, you can easily resolve the error code in the shortest time frame. It is recommended to do not get more into the resolution. If you are still receiving this error code then contact Norton UK Helpline Toll Free Service for instant help from the technical experts.