I Picked Up A Very Damaging Virus

I don't know how or where but symptoms are as follows. I cannot connect to the internet very well. It seems as though any websites i try to surf onto that could pose helpful do not load. When I try to boot from the Cd upon start up my keyboard will not respond. Nor can I enter safe mode because of the disabled keyboard. I cannot update my anti virus and ad removal programs I cannot roll back the system what so ever. I basically can't do much of anything without it being shut down.