How to Solve AVG 500 Internal Error 421
                     How to Solve AVG 500 Internal Error 421?
AVG antivirus is the strong antivirus which secures your 
device from external threat. This, unwanted AVG 500 
Internal error 421 can occur anytime. This software 
monitors the network traffic and creates a line of 
defense between your device and threat. This error 
occurs when you shut down or start up your computer. 
This error also slows down your computer system. You 
can install this trusted antivirus through 
www.avg.com/retail download and install avg product 
key.
 https://www.avg-com-retail.support/
The Causes of This Error:
The causes of the AVG 500 Internal Error 421 are if there 
are infected AVG antivirus files with malware or viruses, 
incomplete download or installation of AVG antivirus, 
other software might have deleted some files of AVG 
mistakenly, and this antivirus changes corrupted 
windows. 
Ways to Fix AVG 500 Internal error 421:
1. Scan for viruses:
The reason of this error may be virus or malware in your 
device. In this situation, you should run a thorough scan 
for malware. After this, you should check that the 
problem still persists or not.
2. Cleaning the system junk:
You should regularly clean the system junk files. For this, 
first you have to click on the “start” button. Then, you 
have to type the “command” in the search box. After 
this, you have to press and hold “Ctrl+Shift” keys on your 
keyboard and then just tap on “enter” key. Here you will 
see the dialogue box in which you type “cleanmgr” in 
that box. Then you have to press Enter key. Now, you will
see the Disk Cleanup starts calculate the space. In the 
dialog box, you have to mark the “temporary files” 
category. At the end, you have to click on the “ok” 
button.
3. Repairing registry entry:
For repairing registry entry, you have to click start. Then 
you have to enter the “command” in the popped up box. 
Here the dialog box will prompt and you have to click on 
“yes” option. Now you will see the Black box windows. 
Here you have to type “Regedit” and then press “enter” 
key. Now you have to select the key related to error 421. 
After this, just choose “export” from the file menu. Just 
type the name for your backed-up file. Now there is an 
“export range” box, you have to select “Selected branch”
from that box. And you will get a .reg file after saving it. 
Now successfully you your backup of your AVG related 
registry entry.
4. Installing Windows Updates:
For this, first you have to click on “start” button. Then 
you have to go to the search box and then you have to 
type “Update” and press Enter key. Here you will see the 
dialogue box of windows update. If you see the updates 
are available. At last, you have to click on Install updates.
5. Installing Windows again:
If you again face the error then you have to install the 
windows again.
This method will solve the AVG 500 Internal Error 421. If 
you are still facing the error then you can call the 
customer care executive anytime on their toll free 
number. For detail information, you can visit to the site 
of AVG through avg.com/retail 2019. 
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