How to fix Avira Antivirus Error 503?
                     How to fix Avira 
Antivirus Error 503?
By James Fell
Avira Antivirus Error 503
O Avira error 503 occurs due to the 
incomplete installation of the 
software. If your operating system 
refuses to support the 
Avira Antivirus software, the error 
code 503 will appear on the screen. 
Otherwise, you can identify it when 
you receive a pop-up of USB drive 
error, frequent popping up of 
permission errors, or other pop-up 
errors. 
Steps to fix Avira Antivirus Error 503
O On your Windows desktop, click the 
Start menu and type “control 
panel” in the search panel.
O In the Control Panel window, click 
the System and security 
tab followed by the Windows Update 
option.
O Click the Check for updates button 
and update your Windows OS if 
available.
O Restart your computer and open 
the Windows Control Panel again.
O Click the System and security tab 
followed by the Device Manager 
option.
O Click the Update driver button and 
select Update driver software.
O Rerun the Avira Antivirus software 
and check if the error 503 reappears. 
O If the problem persists, please refer 
to 
https://antivirus-protection.co/avira-a
ntivirus-error-503
Reference
O https://antivirus-protection.co/avira-a
ntivirus-error-503