Stop using both the CF card and the destination drive until you try recovery. Based on the symptoms, the corrupted files on the PC are unlikely to be repairable in any simple way, and the issue may involve the hard drive or file system rather than the CR2 files themselves.

Your best chance is usually the CF card, not the broken files on the PC. When files are “moved” off a memory card, they’re often just removed from the card’s directory listing; the image data may still be present until it is overwritten. If you have not used the card again, recovery odds are much better. Even if you shot a few more frames, some older files may still be recoverable.

Use a reputable file recovery program to scan the CF card first and recover to a different drive. Do not write anything back to the card. If the destination PC drive is failing, any recovery from that drive becomes a general data-recovery problem, not a photo-specific one.

For the future, copy first, verify the files, back them up, and only then format the card in-camera.