Whenever I try to open mozilla firefox, the hourglass comes up for about 2 seconds then goes away. If I have the task manager open, I notice that the task will show up for a few seconds (ram usage much lower than usual) and then will disappear. I think something may be causing it to automatically close. I really have no idea what to do. I ran AVG and it picked up a trojan or somethin, but I deleted it. My computer seems to be running much quicker, but firefox still isn't working!