The first thing to try:
Take your memory card to your local photo processor and ask them to read the card and copy all of the photo files to a CD for you.
Cost is about $2.00

If that does not work, you will need a card reader and some recovery software.

Buy a card reader that will accept your memory card and install it on your computer.
...(about $20 at any store that sells digital cameras).
Then try to read the card with the card reader.

If that does not work, you need recovery software.

There are hundreds of data recovery programs.
Too many for me to say which is best.
Here are some of them:

http://www.google.com/search?hl=en&q=memory+card+data+recovery&btnG=Google+Search

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