Having trouble getting splunk to start on a Windows 2k8 install. No issues on Linux.
There no specific permissions you need to set, but you need to make sure, the user Splunk is installed to run as a member of Administrative group.
If you install Splunk to run as Local System user and Splunk can start and have permission to collect locally, but not on remote machines. Probably, in some situation, Windows administrator may have set some global settings that don't allow services to run as Local System user.