You then have to type SFC/SCANNOW and then press Enter.Right-click and '˜Run as Administrator'.Go to '˜Start' under search type in '˜CMD'.The System File Checker would be executed to see if the Windows could fix it by itself. It is the usual step to fix several issues related to Windows. We deal with this problem through a series of steps discussed below: Step-1: Firewall not working as Windows could not start Firewall on Local Computer: Firewall not working can arise due to several reasons, and we shall discuss the numerous troubleshooting techniques for the firewall not working issue. However, if the firewall not working issue arises on your system, you must look to solve it in the first go as it can harm your critical data. For the ones who are regularly online, firewall constitutes an important component as it prevents unrestricted access to your system. The essential working of a firewall involves keeping the virus programs at bay. A firewall is an integral component in the functioning of your Operating System.