I have been getting in a lot of laptops lately that have the FBI and Department of Justice virus' on them lately. Be careful on what you click on and view. The top 4 ways to get a virus is:
1) Recent news images based on a search engine result
2) Email that was sent to you from a source that looks trustworthy but is not. (e.g. friend or family member, delivery service like UPS or USPS)
3) Downloading movies or music from a P2P program like Frostwire or using a torrent program like uTorrent.
4) Viewing inappropriate material on the internet.