Thankfully I was able to use a file retrieval program to retrieve the corrupted files

It seems that the third time was the charm as I haven't had any corrupt files since then

One day of busy shooting in my Nikon D300, and about 1000 images later, more than an hour of download problems and 2 corrupted files that temporarily corrupted my computer.

When I returned, I contacted Sandisk and they led me through some techniques to try to solve the problem, but a few weeks later more files were corrupted, so I returned the card and got a replacement