Replying to Help With Premiere and GoPro

Hello M&A, I'm having a few problems with editing, which i'm fairly new at. I just got adobe premiere cs5.5 and it's working good, and I also got a GoPro HD Hero 2 for christmas. I can get the videos into premiere fine but when I play them in there, like in the top rightish part of the screen where it plays what you've edited, it's extremely laggy and will skip ridiculously. Is there something I can change to make the playback better? Also, on my gopro when you transfer videos off it onto the computer, how do you get them off the sd card? I put the videos into my video section, dragging them off the sd card folder, but when i turn my gopro on it still says 28 videos and only like an hour left of footage. Help Please! Much karma