Not the best of ideas, deleting images while looking at them on the camera LCD. Lots of quite good images don't show well on a small screen. And lots of marginal images can be greatly improved.

globalgadabout: That's a bad idea if there's potential corruption on the card, you'll be making a lot of changes to the filesystem - which usually only makes things worse. The best option with a bad filesystem is to do as little as humanely possible with it until you can make a stab at recovery. I also tend to agree with Bob that camera screens are a bad way of determining overall quality anyway...

BobTrips.....I think sometimes you can spot the duds, and it just seems that OP has quite a lot of photos to upload all at once....however......LAN, I sit corrected, didn't realise that deleting from the card at this stage might make things worse...static2....good luck

Well i find a rather simple solution, the computer i was using (not mine) had a direct slot for sd cards and once card inserted all programs read card find. Dont know now if i should use the card for photos or what the real problem was and if it will happen again in future? Thanks again

First thing I would do is to format the card in the camera.
Second, I would make that card my backup, not primary card.
I'd also take time to test it out. I'd shoot it full of worthless images (just fire away at nothing important) and see if it has upload problems.
Finally I'd get a card reader and use that rather than using the camera for uploading.