I opened Tor today and updated as advised. The installer downloads and opens, so I saved to desktop, but now Tor won't open. Running Windows 8.1, Comodo antivirus ( which has been adjusted to allow Tor to open)

Tor appears briefly in Task manager, then disappears. Other browsers including Firefox open as normal

2 Answers 2


I am in the same boat. Have your seen this on the Tor site

"Windows users that are affected by Tor Browser crashes might try to avoid this problem by opening "about:config" and setting the preference "media.directshow.enabled" to "false". This is a workaround reported to help while the investigation is still on-going."

So enter about:config into the URL bar and accept the following warning. Now you see a list of settings. Enter media.directshow.enabled into the search and double-click on the entry to set it to false.

  • "But I haven't a clue where this setting is" <-- Type about:config in the URL bar. You get a list of settings. Find the one named media.directshow.enabled and switch it from true to false by double clicking on it.
    – Jobiwan
    Oct 23, 2014 at 15:35
  • Thanks - however , when I click on the "Start Tor Browser" shortcut it attempts to load but nothing happens. Is there a registry entry I need to nuke or do I need call Tor from Firefox Oct 24, 2014 at 16:23
  • I don't know, sorry. I don't run Windows. I just pointed out where that setting can be found and edited.
    – Jobiwan
    Oct 24, 2014 at 16:44
  • @Jobiwan thanks anyway your comment is useful as I would never have thought to look at the browser bar. Oct 25, 2014 at 17:46

The issue is actually quite well known and is being worked on. Most of us are encouraged to use Rapport antiPhishing software. However, this currently prevents Tor from running. This being looked at I am told.

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