avast! Firewall NDIS Filter Miniport#503(driver installation isn't successful)

Avast Free Antivirus / Premium Security
1

One day when I restart my computer this message occur.
So why? what that means?

https://www.google.com/search?hl=zh-TW&client=firefox-beta&hs=uRU&tbo=d&rls=org.mozilla%3Azh-TW%3Aofficial&q=avast!+Firewall+NDIS+Filter+Miniport+%23503&oq=avast!+Firewall+NDIS+Filter+Miniport+%23503&gs_l=serp.12...7282.9856.0.16542.3.3.0.0.0.0.342.391.2j3-1.3.0...0.0...1c.1.igjfTGPSQsE

search in google just one link in Russian. Mind Control…

2

My firewall isn’t working, what must be done to fix and repair ?