So apparently McDeliver(possibly someone else) uploaded a file on MPGH earlier and in the post was a link to a youtube video, in the description of the video was download link to a file sharing site and many people downloaded that. From reports the hack has caused flickering of mice on screen and webcams turning on so this is obviously not normal(also the file is unusually large). All the links to the download should of been taken down, if you have downloaded 4.0 please remove the file and run a virus scan of your computer immediately.
Don't know if it's gone or not? Press ctrl+alt+del and go to processes, be sure to order it so that it shows the processes that use memory the most first, if you see unusual programs running at high memory then right click it and open file location and delete the file. Since it's a virus that monitors the users computer it should use quite a bit of memory on your computer.