virus help needed

BIS Toolbar and Hunt Bar – can’t get rid of
Spybot and Adaware can’t delete these, the PC ends up hanging up. The other problems that appear, I am able to delete but the are back after a reboot. I can’t turn the PC off normally; I have to use a safety pin in the side of the laptop to turn it off. Help! Are there any other programs that I can use to get rid of these? Freeware would be great if available; if not free, what software would you recommend? Thanks.