WHAT TO DO:
First, be sure you're running a recent enough Tor Browser Bundle. That should keep you safe from this attack.
Second, be sure to keep up-to-date in the future. Tor Browser Bundle automatically checks whether it's out of date, and notifies you on its homepage when you need to upgrade. Recent versions also add a flashing exclamation point over the Tor onion icon. We also post about new versions on the Tor blog: https://blog.torproject.org/
Fourth, consider switching to a "live system" approach like Tails . Really, switching away from Windows is probably a good security move for many reasons.
Tor advises users to avoid Windows
Posted on Thursday, Aug 08 2013 @ 11:12 CEST by Thomas De Maesschalck