guys, so this is what happened.. a couple of days ago, strange ads started to appear in my browser.I found lots of information in google (it turned out to be from a thing called Plus HD.) and folowed a removal guide (i used this one, if it's at any importance http://www.xp-vista.com/spyware-removal/plus-hd-removal-guide ) and i did all the steps. And I think it's gone now, but the article says to use an antivirus program. the one they suggest is unknown to me and i really don't think it's necessary.. What do you guys think? should i use one, or is my problem solved already? and also is http://www.malwarebytes.org a good choice?