My computer has a virus, which dissapeared the run menu, the icons on the desktop flash in and out. I have tried bit defender online, the computer stops before it finishes and freezes, same thing for kapersky online. I bought the kapersky antivirus, and sometimes it runs sometimes it does not. I t appeaers to have found over 25 different infections especially trojans, but it does not removes them of freezes up. When It says that the antivirus kapersky needs to restart the computer to function correctly, it never restarts it just stays on the windows xp page and stays there foreever. Help, please!