I can't view any photos and my computer doesn't recognize my memory stick pro at all? It was a brand new card!

I just got back from vacation and during that time took a new 4GB sony memory stick with me. It worked well till the 3rd day. I took about 150 photos and when the error popped up I couldn't view them. I was hoping that when I connect it to my PC it will work, but it didn't. My camera is fine, I tried other cards and it worked. It is just this card and I would like any advice on retrieving pictures. I bought a card reader yesterday and installed 4 programs to recover pictures, and none of them worked! Please help! Those pictures are my memories of vacation.

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