Welcome to Android Central! What device do you have, and how are you transferring the photos to your computer?
Also, are you sure the photos are broken on your computer? I sometimes see photo thumbnails look broken on my computer, but when I double click the thumbnail, the photo actually opens correctly.
Ok I'm on a note 2, and I use the USB cable to import my photos to the desktop. After closer inspection, they are png files (1x1, 86mb)? What are those? They show a super small image on thumbnails. When I open them I just have a blank (white ) screen.
Are you using the Import Photo function in Windows Explorer? I tend not to use that function, because it copies over all images, including thumbnails that might have been cached in your device from your browsing, or from other apps. I would just use Windows Explorer to drag and drop the photos you want to copy or move to the computer. Can you do that?