For the last three days I have been trying to get the Tor Browser Bundle v4 to work on Windows 8.1. I have installed and removed the program and reinstalled probably ten times. I have downloaded the package from the Tor Project website at least six times. When I try and launch the bundle, I get the spinning circle for several seconds and then it disappears. Under Task Manager I see no processes marked as either Tor or Firefox.
I have found that the Tor Bundle will run on the Windows 8.1 machine, if it is booted into safe mode with network support.
I have found that the Tor Bundle will run on the Windows 8.1 machine, booted normally, if a program called Trusteer End Point Protection (Rapport) is disabled.
Trusteer (Rapport) is required for my on-line banking, etc. I don't know which port Trusteer uses. I suspect a port conflict but have not been able to verify that.
Any suggestions appreciated