Windows Firewall: MMC could not create the snap-in

Question

On Windows Server 2008 when trying to open either Event Viewer or Windows Firewall settings, I'm getting the following error:

MMC could not create the snap-in. The snap-in might not have been installed correctly.    
Name: Windows Firewall with Advanced Security    
CLSID: FX: {b05566ac-fe9c-4368-be02-7a4cbb7cbe11}

Answer 1

Seems that there are some snapins/dll corrupted ...

Have you tried to run a scandisk ? (sfc /scannow)

if the scandisk doesn't resolve the problem try registering the snapins dll :

1. Open a command prompt with administrative privileges

2. Copy and paste the following commands into the elevated command prompt, or you can save the commands into a batch file, and then execute the batch script:

   regsvr32 /s adprop.dll

   regsvr32 /s azroles.dll

   regsvr32 /s azroleui.dll

   regsvr32 /s ccfg95.dll

   regsvr32 /s certadm.dll

   regsvr32 /s certmmc.dll

   regsvr32 /s certpdef.dll

   regsvr32 /s certtmpl.dll

   regsvr32 /s certxds.dll

   regsvr32 /s cladmwiz.dll

   regsvr32 /s clcfgsrv.dll

   regsvr32 /s clnetrex.dll

   regsvr32 /s cluadmex.dll

   regsvr32 /s cluadmmc.dll

   regsvr32 /s cmproxy.dll

   regsvr32 /s cmroute.dll

   regsvr32 /s cmutoa.dll

   regsvr32 /s cnet16.dll

   regsvr32 /s debugex.dll

   regsvr32 /s dfscore.dll

   regsvr32 /s dfsgui.dll

   regsvr32 /s dhcpsnap.dll

   regsvr32 /s dnsmgr.dll

   regsvr32 /s domadmin.dll

   regsvr32 /s dsadmin.dll

   regsvr32 /s dsuiwiz.dll

   regsvr32 /s imadmui.dll

   regsvr32 /s lrwizdll.dll

   regsvr32 /s mprsnap.dll

   regsvr32 /s msclus.dll

   regsvr32 /s mstsmhst.dll

   regsvr32 /s mstsmmc.dll

   regsvr32 /s nntpadm.dll

   regsvr32 /s nntpapi.dll

   regsvr32 /s nntpsnap.dll

   regsvr32 /s ntdsbsrv.dll

   regsvr32 /s ntfrsapi.dll

   regsvr32 /s rasuser.dll

   regsvr32 /s rigpsnap.dll

   regsvr32 /s rsadmin.dll

   regsvr32 /s rscommon.dll

   regsvr32 /s rsconn.dll

   regsvr32 /s rsengps.dll

   regsvr32 /s rsjob.dll

   regsvr32 /s rsservps.dll

   regsvr32 /s rsshell.dll

   regsvr32 /s rssubps.dll

   regsvr32 /s rtrfiltr.dll

   regsvr32 /s schmmgmt.dll

   regsvr32 /s tapisnap.dll

   regsvr32 /s tsuserex.dll

   regsvr32 /s uddi.mmc.dll

   regsvr32 /s vsstskex.dll

   regsvr32 /s w95inf16.dll

   regsvr32 /s w95inf32.dll

   regsvr32 /s winsevnt.dll

   regsvr32 /s winsmon.dll

   regsvr32 /s winsrpc.dll

   regsvr32 /s winssnap.dll

   regsvr32 /s ws03res.dll

I've resolved one time a similar error on windows server 2003 with this procedure.