Image Problems with Sony Alpha Cameras or Lexar CF cards: part 2

On Mikes suggestion (thanks Mike), I downloaded pictures to my desktop and noticed some bad pictures (4 out of 300 some). I tried to download the Compact Flash card to Marys computer, but it crashed! (vista, who knew?) Then, using the same card and reader, I downloaded to my Netbook and , no errors! So, my problem exists on my desktop for sure, but what that problem is, I don't know. I'll keep digging for the answer though!