I was on my pc last night and my firewall suddenly turned itself off. I turned it on again and did a scan, I have avg 2012. Got up this morning and my computer has been giving me problems ever since. I keep getting random pop ups everywhere telling me I have won an iphone 4 etc, my avg is telling me I have a trojan, but it could not remove it. Decided to download malwarebytes, did a full scan, mentioned something about a rootkit, at the end of the scan I had 71 threats, malwarebytes said it removed one of them, restarted my computer, just done another scan it said zero threats, but I am still getting the pop ups. Also, everytime I go online i get a notification bubble from malwarebytes saying successfully blocked access to malicious website: 188.8.131.52, type: outgoing. Does anyone know what I could do to fix this? also, should I change my passwords etc or is that side of things ok? Thanks.