I have this downloaded onto my laptop for virus protection while I'm in college. I took it to a hotel and the wifi was unprotected and I went to download a PDF and it downloaded a threat that won't leave no matter how many times I have it removed. Before it didn't allow any pop ups on my laptop and now I'm back to my college and it has the same threat and pop ups are now occurring and my it's load time is slow and it freezes. How do I fix this?!