Yesterday I tried downloading pacman through limewire and it came up as just "setup.exe" so i attempted to..

download the program. and i guess setup was just a virus im guessing? so after i clicked on the setup, all these pop-ups kept coming up.. and limewire kept opening and closing and i can't get on myspace or many other things thru the internet and i cant do much, so i deleted the setup.exe off my computer and now its stil not working. any help?