Hi, my computer is running win xp prof service pack 2 and got the security centre virus. I ran AVG which found trojan downloader and other problems and after I set it to heal it said it was complete but when I tried to work the computer still had pop ups everywhere and froze. I had to turn off by pressing and holding the power button but then when I try to start up again it loads up to the Windows load page then the screen goes completely black with just the arrow cursor and I can't do anything. Is it hopeless? I'm supposed to be writing essays for uni and am really starting to stress. Please can anyone help?