snap-in failed to load with error code 0x6D9 at windows 7 firewall

Hi. i have a problem few days now.i try to open my windows 7 firewall but nothing happen's.i'm trying then to open the windows firewall advanced security but i get an error that the 'snap-in failed to load with error code 0x6D9 .i'm searching for a solution for hours,i try a several tips but i get no results.I also did a full scan with security essentials,super antispyware,Malware bytes,Eset on line scanner,TDSS rootkit removing tool but the computer seems to be clean.
Everytime now i restart i take message on start up that the " the windows could not connect to the group policy client service" and when i open a program after some resets on the firewall i did while try various tips from forum's,i get the message if i want to allow on the firewall the each connection of specific program.
Can somebody help me ?thanks

thanks for your reply but i have already read this post and i didnt find help on this

Ok,here is:
Results of screen317's Security Check version 0.99.56
Windows 7 Service Pack 1 x86 (UAC is enabled)
Internet Explorer 9
``````````````Antivirus/Firewall Check:``````````````
Windows Firewall Enabled!
Microsoft Security Essentials
Antivirus up to date!
`````````Anti-malware/Other Utilities Check:`````````
SUPERAntiSpyware
Malwarebytes Anti-Malware version 1.65.1.1000
CCleaner
JavaFX 2.1.1
Java(TM) 6 Update 22
Java(TM) 6 Update 31
Java 7 Update 9
Adobe Flash Player 11.5.502.110
Mozilla Firefox (18.0)
Google Chrome 21.0.1180.77
Google Chrome 21.0.1180.79
Google Chrome 23.0.1271.64
Google Chrome 23.0.1271.95
````````Process Check: objlist.exe by Laurent````````
Microsoft Security Essentials MSMpEng.exe
Microsoft Security Essentials msseces.exe
Malwarebytes' Anti-Malware mbamscheduler.exe
`````````````````System Health check`````````````````
Total Fragmentation on Drive C: 0%
````````````````````End of Log``````````````````````

i want to edit the firewall in some case's i there need's to

there is no way to fix this issue,resolve the Error code 0x6D9 and take the firewall window back to normal?i suppose this happens after windows 7 update