my friend inherited a computer which is infested with everything under the sun. seems to have viruses and spyware galore. lots of porno etc. has win xp as operating system. had dsl installed but can't really do anything with pop ups running the show etc. how can the computer be reformatted [completely wiped clean]with a fresh start when he doesn't have any xp discs? also will a reformat mess up the dsl installation settings[email etc.]?