I got that a few months back. I was able to restart my computer in Safe mode (when your computer starts push I think f8, you will see prompt). The Virus works by putting a shortcut on your windows start up configuration to make it automatically start internet browser and then go straight to FBI website (that awesome screen you are stuck on).
Now the fun part. The virus root files have been changed several times it may not be the same as what I had on my computer. I googled on another computer or your phone "how to remove FBI virus" and multi sites come up to remove. You will have to find the root files to delete to get rid of the virus. I like AVG maleware remover (may work may not). I ended up totally reloading my computer to get rid of it. I spent hours and hours working on it. I still ended up taking my laptop to my computer guy to reconfigure. He had it all fixed in a morning and charged me $80.00 and told me he could have saved everything and would have charged me less if would have just brought it to him in the first place. If your not super computer savy I would take it in (lot less aggrevating).
