I was looking on the internet the other night and my Dell was infected by something when I clicked on a Lawn Mower Parts site. I didn't get what I had hoped, in fact I'm not sure if what I got,  would be for a lawn mower.  I have a messed up hard drive that won't clean up with virus protection.  Am I needing to get my hard drive wiped out and reloaded or do I need to replace the hard drive?  I bought this computer a year ago and I've never had this happen before.  It's bad.  I can't get anywhere on the internet without this porn stuff poping up, instead.