Unable to activate Firewall

I had an attack of viruses on my computer , after removing & cleaning evrything it's seemes that the computer is clean & working fine , the only problem left is the subject , when trieng to enable firewall I receive a massage

Code:

Security center could not turn on firewall

when trieng to do it from control panel & windows firewall I get another massage

Code:

Due to an unidentified problem , windows can't display firewall settings

Maybe someone have an idea how to solve this problem.

Thank's

 

Try clicking on start, on run, keying in

Code:

sfc /scannow

and OK.

 

Security service

1. Start -> Run: "regsvr32 c:\windows\system32\hnetcfg.dll "
2. Restart the Security Center service.

This problem crops up if this dll is not registered.

 

There were feedback's , meentime I decided to re-install XP (hopefully last time becase who knows what else went wrong & I m doing mass work in my computer. This problem was caused by a virus & I assume there were other invisible problem that can popup later during work on the computer.

Thank's

 

This worked for me when my firewall would not start.
At a command prompt: netsh winsock reset
Reboot.