Recently, I found that my computer was infected by a virus that slow down my computer, when I started my computer, it seems much slower and black screen for a long time before starting the window. It boots up sometimes until 2 minutes. I tried to uninstall the software such as Antivirus 360 total security and my Firefox browser. However, it becomes more slower. And the problem did not solved after I cleaned the junk files using 360 TS and disk space. So, I used the FRST recovery tool to scan. But the problem become more serious when I uninstall and reinstall the antivirus and Mozilla, the black screen become more longer time. I found these problems existing about 1 weeks ago, when I downloaded a video and played the flash game. I also found that some of my emails also had changed the password but I don't changed it. The bookmarks for Firefox also have gone so I created a new profile.