So ... I installed the app, but at the tail end of the install it gave an error about not being able to start the application. A quick 'netstat -an' confirmed port 8000 wasn't listening, so I checked the Windows event log... which generated this:
Faulting application splunkd.exe, version 0.0.0.0, time stamp 0x4c8210b4, faulting module midas32.dll, version 0.5.1633.2367, time stamp 0x4acc7167, exception code 0xc00000fd, fault offset 0x00023303, process id 0xea4, application start time 0x01cb640cca16855c.
So, a re-start of the Splunk service actually opens up port 8000, but when I try to connect to it, I never actually get a page, just an infinite wait.
In general, any time you see a hard crash like that, it's a good idea to open a support case directly with Splunk.
That said, midas32.dll seems to be associated with BitDefender -- are you by any chance running BitDefener for antivirus? If so, it would be worth the experiment to disable/remove it, or try a different antivirus product, and see if the problem persists.