When you open the Windows Firewall with Advanced Security snap-in in Windows 7, the following error may be displayed and the snap-in loads up blank:

This has to do with the permissions pertaining to the Windows Firewall registry key (SharedAccess), and here is what I did to fix the error:

Click Start, type Regedit.exe and press {ENTER}

Navigate to the following branch:

Right-click FirewallPolicy, and click Permissions…

Click Add…

Type NT Service\MpsSvc and click OK.

Select MpsSvc, and click the Advanced button

Double-click the MpsSvc permission entry

Assign Query Value, Set Value, Create Subkey and Enumerate Subkeys Permissions by ticking the appropriate checkboxes.

Click OK, then OK, OK in the resulting dialog boxes.

See if you’re able to open Windows Firewall with Advanced Security MMC snap-in now.

Well! I could, after completing the above steps.

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