tor.exe was getting flagged by Windows Defender earlier, but it should be fixed since about 20 hours ago. Can you try the instructions in the following post?
If you are a Windows user and a TorBrowser user, you are probably not without knowing that the latest version of TorBrowser, or more specifically the tor.exe it contains, was flagged as a trojan by Windows Defender.
We finally received a reply from Microsoft:
At this time, the submitted files do not meet our criteria for malware or potentially unwanted applications. The detection has been removed. Please follow the steps below to clear cached detections and obtain the latest malware definitio…