My attempts to install a Splunk forwarder on Windows 2008 fails and is rolled back.
In this case, the application event logs show:
Faulting application openssl.exe, version 0.0.0.0, time stamp 0x5666e2ba, faulting module LIBEAY32.dll, version 184.108.40.206, time stamp 0x5666e274, exception code 0xc0000409, fault offset 0x0000000000064b0e, process id 0x684, application start time 0x01d14748dac0bc14.
I have encountered this specific error with splunkforwarder-6.5.1-f74036626f0c-x64-release on Windows Server 2008 R2 Standard SP1 64-bit when attempting manual install over RDP. Installing via local console allowed install to complete successfully. Hope this helps.