I believe I encountered a rogue software last week. Received a pop up for a trojan virus. Ran my AVG software and thought I repaired system. Now windows close on their own. I cannot update windows or any antivirus. I have run AVG, Avast, SuperAntiSpyware and yahoo antivirus….nothing is found. I can not do a system restore, nor can I start up in safe mode (F8). I am running Windows XP. Can someone tell me where to turn next