SCOM does not generate alert for logical disk space

Question

Hi,
Today we noticed that one of agent in SCOM has drive space below 5% and 500 MB but SCOM did not generate any alert.
I have also verified that there is no override set for this agent's logical disks.  I have also verified that discovery is able to discover all disks on server but monitoring is not working as expected.
I have flushed health service on agent but it didn't help.
When I gone through event logs on agent, I found below events:
Log Name:      Operations Manager
Source:        HealthService
Date:          5/26/2014 5:13:05 AM
Event ID:      1103
Description:
Summary: 6 rule(s)/monitor(s) failed and got unloaded, 1 of them reached the failure limit that prevents automatic reload. Management group "XXXXXXXX".
This is summary only event, please see other events with descriptions of unloaded rule(s)/monitor(s).
Log Name:      Operations Manager
Source:        HealthService
Date:          5/26/2014 5:14:21 AM
Event ID:      1206
Task Category: Health Service
Description:
Rule/Monitor "Microsoft.Windows.Server.2008.LogicalDisk.FreeSpace", running for instance "F:" with id:"{36ED7395-3798-A361-5017-327F6FA50030}" failed,
got unloaded and reached the failure limit that prevents automatic reload. Management group "XXXXXXXXX".
Please let me if what we need to do here.
Thanks.

Answer 1

Do this
Change startup type to Window Management Instrumentation (WMI) Service to disabled
Stop the WMI Service; you may need to stop IP Helper Service first or other dependent services before it allows you to stop WMI Service
Rename the repository folder:  C:\WINDOWS\system32\wbem\Repository to Repository.old
Open a CMD Prompt with elevated privileges
CD windows\system32\wbem
for /f %%s in ('dir /b /s *.dll') do regsvr32 /s %%s
Set the WMI Service type back to Automatic and start WMI Service
cd /d c:\  ((go to the root of the c drive, this is important))
for /f %%s in ('dir /s /b *.mof *.mfl') do mofcomp %%s
Reboot the server
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