So Play Store app could not be downloaded due to an error (495).
And internet in general seems to stop working on your Android device. The only site that is working is Adblock. Well, Adblock may be the root of the problem. The Android Adblock standalone app creates a local proxy server, and all other apps access internet through this local proxy, so it can block the ads. But when you remove Adblock, it fails to remove these proxy settings. So to correct the problem, go to advanced settings of your WiFi connection and untick proxy server. Everything should work now.