Whenever I turn on my computer, I get several pop ups that try to direct me to a site to correct some sort of critical error or that I need to fix a corrupted something for my computer to work again. What does this mean ? Should I take my computer in to be repaired? I tried to go to one of the web sites in the past & they wanted me to pay money to register on a website, but wouldn't tell me the problem with my computer. This left me a little suspicious...