underdrive pulleys

Hey all, I am actually in the process of installing the AEM Pulleys on my Civic, but I'm having some trouble with the power steering pulley. I got the belt off and all, and we thought that we had loosened the bolt that holds the stock pulley on, but after literally a half hour of supposedly unscrewing it we realized that we were getting nowhere. The bolt does turn, but it doesn't seem to be making any progress towards coming off. Is the screw stripped, or is there something I'm just missing? Thanks...