Photos being transferred from SD-HC 4GB memory card

My camera is COOLPIX S630 and when I transfer photos from the memory card to my PC (Vista) and select the ones to be pulled into Adobe Photoshop Elements 5.0, the transfer corrupts up to half of them. They either don't show or color lines appear across them.

I save the ones that are okay, delete the ones that are not from Elements. Then I reinsert the memory card and some of the ones that became corrupt during the first tranfer, will pull in okay the second time. When I look at my photos on my camera, they are fine. When I take my memory card to have prints made, they print fine. Only when I want to pull them into my computer, is there a problem.

Thanks for your advice.