I'm pretty sure my Mac has a virus. At first It wouldn't let me open up any applications nothing was responding. I shutdown the computer the whole night. Powered it on this morning it was running slow but I was able to open up the Internet and I was trying to download macafee virus protection through my att net uverse service and It would not let me. I tried to download a virus protection thru comcast(my dads account) and it also wasn't responding. But if I try it through my phone it works perfectly fine. I'm assuming this virus will not let me download the virus protection? I don't know much about computers. Can anyone help?? What should I do next??