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Some more Ideas to solve this prob
This firewall issue is commonly found on vista and windows 7 (64 BIT OS)
This is symptom for rootkit on 64 bit systems
if you find a folder called system64
C:/WINDOWS/SYSTEM64(not the sysWOW64)
and a file called consrv.dll
C:/WINDOWS/SYSTEM32/CONSRV.DLL
You're infected by zero access rootkit.It is recommended to contact malware removal forums to remove it first and try the fix
Download both the registry files
Windows firewall - Firewall
Base filtering engine - BFE
Launch them,You should get a UAC prompt now
Click YES & Restart your PC
Now,Press Windows+ R key and type
regedit and click ok
go to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\BFE
Right click on it-permissions
Click on ADD and type
Everyone and click ok
Now Click on Everyone
Below you have permission for users
Select full control and click ok
Now,open RUN and type
services.msc and click ok
start base filtering engine service and then windows firewall service
You may also be missing security center and windows defender services
Download
Security center -wscsvc
Windows defender - windefend
Launch them and click YES when you get a UAC prompt
Good luck
All credit goes to the below post, NanduPradeep Kumar.
Trying to turn on Windows firewall, getting Error code 0x6D9 - Microsoft Answers