I am trying to get rid of everything earthlink and This total access care thing won’t let me because of certain things are in use. Like the popup blocker and the spyware wich is no ware to be found!

I have two virsuses on my computer–downloader and spyware. How do I remove them?
Also, I have a very vulgar page that comes up from time to time even though I have a popup blocker on.