Hi, I really hope someone can help me here. I am not sure what my husband did, but now the only thing showing up on my computer screen is a PC Total Defender. I am pretty certain it is not legit, but I have no idea how to get rid of it. There are NO icons on the screen or a start button, only this defender. I have tried control alt delete, nothing. I have turned the computer off and back on, and it pops right back up. I try to X the defender it says, "The operation is prohibited. Please check your settings" But I have no idea how I can fix this issue when I have no too bar, icons, start menu, nothing! Please help me! Thank you!