asio overload spike

Hey can Anyone one help me??? I am having my asio meter jump to 100% and stay there, I am using Cubase Le5, tascam us-2000, HP pavilion dm4 quad core I5, window 7 64 bit, I just upgraded from 4 to 8 gigs of ram hoping this would go away. Please contact me at I live in Chicago and I play drums.