I NEED HELP

hey um.. i was downloading bear share.. and thats a virus i know it is tho i wanted sumting to download to download music... anywaiz i had turned my spyware off mi nortan antivirus and me the stupid bimbo didnt think of virses.. anywais i got a virus and it has turned my nortan antivirus off.. and it wont let me switch it back on so i can delete the virus.. so thats where im looking for the help..??