You are on the internet and suddenly a window pops up, saying "You have all kinds of infections on your computer, and to click on this link to fix them". This will actually infect your computer with a virus. This is Rogue Security Software in action. There are 2 things you can do if you see one of these pop up on your computer: 1 press and hold ALT then the F4 key. If... this doesn't work, shutdown of your computer. Either by clicking on the Start button and choosing shut down, or if this doesn't work Press and hold the power button on you PC for at least 4 seconds until the PC turns off.