Windows 7 firewall can not be enabled to solve

Symptom:
1. Click on the firewall in the Windows 7 Control Panel. "Recommended Configuration" has no response. 2. Open “service”, can't start windows firewall, and report an error. 3. Open the “Event Viewer” and select “Windows Log” to find the most recent error. The event ID is 7024 and the log content is “The Windows Firewall service denied access.” . Stop with a service specific error.
Solution:
Tip: Modifying the registry is risky, please be cautious.
1. Open the registry (How to open the Registry Editor, how to open the Registry Editor), find HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\SharedAccess;
2. Right-click SharedAccess, select “Permissions&rdquo ;;
3. Click “Add”.
4. Enter “NT SERVICE\\mpssvc” in the text box below the input object name to select ”, then click on the right side of the &ldquo ; check the name & rdquo;, the content of the text box becomes "MpsSvc";;
5. Click “ OK & rdquo;;
6. Set the permissions of "MpsSvc", check "ld"; Full Control "Allow"Allow”;
7. Click “OK”.
Now go back to the control panel and select Firewall. Click “Recommended Configuration”