I bought the new Sony Vaio VGN-cr515e and under that I am using the Windows Vista operating system. Mine system was working fine and I have no problem. Since last week, mine portable affected the virus will not let me boot my laptop. I have no personal things I need to maintain and restore the factory settings will not be a problem. The problem is that small and pressing F8 during boot zero will not work. The whole thing comes from a black screen with a cursor in the upper left of the screen. Both F2 and F12 are still working. Now I do not how to restore the mine system and can anyone suggest in this regard. I also had the Norton anti-virus.