If you look at the files in the camera before transfer, are they appearing to be OK?
If so, it seems likely that the transfer process is the issue. For starters, how about trying the tried and true method of removing the card and putting into an appropriate SD card reader attached to the computer, thus taking the transfer software out of the equation?
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
