I need help my laptop lenovo c200, i install avast antivirus it was running fine but when i shut down the system and boot it, it will log and i will insert my password and it will show starting window after that a black will appear and a blinking mouse i try to leave it nearly and hour but no solution please help me.

Once it finishes booting press ctrl alt del to start task manager then go to startup app u ll see avast then rite click nd open file location. Locate avstUI and open. Go to security in avast then behavior shield then settins then trusted proceses add explorer.exe under windows folder . Restart system. Lemme knw if it works. Am assuming its windows 8