So I am running Windows Vista HP on a month old Toshiba Satellite laptop. It normally runs fast, but lately it has been going slow. AVG says it found a trojan virus LOP. I try to delete it, but as soon as I restart my computer, the problem is back. Randomly a windows explorer window will open with a website saying I may have a trojan virus and that I should download their anti-virus. The only way I can close these popups is through the task manager. Can someone please help me? I've been at this for over a week, and I can't get rid of this problem. I seem to have tried everything I can think of or discover, and nothing has helped.