Had an encounter with Cryptolocker on a notebook running Win7. .docx and .xlsx files that were critical to the client were compromised. Once the virus was removed, attempted to restore corrupt files. As most have reported, this it impossible. Got to thinking that maybe some of the files had been previously deleted and might be restored and retrieved. Ran RECUVA and found thousands for deleted files. Some had been overwritten and were not retrievable. Others, with .docx and .xlsx, were fully retrievable. They did not have names, just numbers - many of which were in sequence. Once they were restored, it became obvious that the very files that were critical had been deleted after being named with a number followed by the same extension as the original files. I am not an expert, but I have more than 30 years of experience in the field, and started hunting and killing virus infections before any software to do so was available. This might be something worth checking on other systems that have been infected by Cryptolocker. Maybe some genius out there can come up with a utility to undelete these files after killing the virus, and connect them with their original names. Hope this is helpful someone.