Seemingly you need to fix the wmi problems on those tow windows servers before you can make windows app work.
I would like to suggest you to resync the performance counters on those two machines.
But surely I cannot guarantee it works or risk free.
Probably you would like to talk with your windows system administrators first.
The command:
winmgmt /resyncperf
If you like to clean the old data before you resync the counters you can try the following command:
winmgmt /clearadap
After you resync the counters you need to restart the wmi service on those tow machines.
You can find more information in this document in Microsoft Support Site
http://support.microsoft.com/kb/266416
Once you got the wmi classes come back, I think the windows app can work.
For install universal forwarder(uf),
Make sure the uf is installed with a account having proper privilege (it should be ok if you use default option while installation).
And Maker sure there is no firewall block the communication between universal fowarder and splunk server.
Hope you have a nice day.
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