I had Tor Browser 6.5.2 running perfectly and after the upgrade to 7.0 stopped working, tried disabling the antivirus but Tor Browser is not starting at all, please help, my OS is Windows 10.
I had the same issue - on investigation the the cause the problem on my pc (Win10 x64) appears to be linked to an incompatibility between the latest versions of the Tor browser and the IBM Trusteer Rapport banking sercurity software. I found that disabling the Trusteer software/ services allowed the Tor borwser software to start normally. However, after re-enabling the the Trusteer software/ services I was not able to start the Tor browser again.
I also had this problem starting with TOR 7.0.1 and reverted to the 6.5.1 version. I checked the Trusteer status - I'm running Trusteer Emerald Build 1804.121. Check https://www.ibm.com/support/knowledgecenter/en/SS7MJT_1507/ug/t_Stopping_Rapport.html for instructions on stopping and starting Trusteer. Stopping it while running TOR worked for me with TOR 7.02. Restarting it was just as straightforward. Thanks for the tip! Awesome. [Ron]