I recently got back from my first trip to Walt Disney World. When I was viewing my photos, I rotated some of them so they would be in the correct position (lanscape or portrait).

I noticed aferwards that all of the images I rotated were now "greyed" as in this screenshot below:

When I went to upload my photos to my photo sharing website, none of the "greyed" ones will upload, only the images I didn't rotate will upload. Its' as if the other ones are now corrupt or invalid simply because I rotated them in Windows 7. What in the world did I do wrong? HELP!