Unreadable JPEG files

I took some photos with my digital camera. A part of these pictures are readable but a large parts isn't. I tried to read them with several programs (Photoshop, Paint shop pro, IrfanVieuw,...) but this doesn't change a thing.
All these pictures were taken on the same day with the same memory card.

Some examples:

Good one: http://www.bhoys.be/Bhoys/Photos/error/IM005971.JPG

Wrong one:
http://www.bhoys.be/Bhoys/Photos/error/IM006005.JPG

If anyone has a solution for this problem I would be very greatfull.

Do they preview in your camera? Is it possible that there was some corruption during the transfer? If your card old/damaged/warn out?

That's the problem some them did, some didn't. But can't remeber wich ones could be seen and wich not.

You may have a bum card. Fill up the card with images (just keep shooting something) and see if the problems happen again. Then, if possible, try another card and see if it happens.

If you can't duplicate it on a different card, then you've probably got a bum card.

Maybe try (if you could) reading the memory card in a card reader, to check it isn't your camera doing anything wrong.

I 've taken some more pictures and the're readable. If I use my memorycardreader I can write and read pictures and other data. (card OK)

I transfered my data directly from the card to my harddisk via a cardreader (like last weekend) and had no problems. I can also read them with my camera.

To make sure my camera is ok I tested my card with another one and had no problems at all.