Did the original poster try this fix and can confirm this resolved the issue?
The KB mentioned does not state that it applies to Windows Server 2008 R2, but the 'Applies To' page at the link hasn't been updated since 2009.
I currently have a support case opened for this exact issue, Windows Server 2008 R2 and Splunk 5.0.1. Did not see this issue prior to 5.x upgrade.
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