As this was recently you might just have caught the same chinese crap-worm I had and that seems to be on every PC I used in Asia.
It's a basic bugger and you're images are all still and truly in place. And even better, real easy to get to:
Go to your folder option and active the show hidden files and folders checkbox if not already on. If not there yet go back to your options and uncheck the "Hide Protectied operating system Files (Recommended)" checkbox. Windows will tell you that's a bad move but do it anyways.
If you were caught by the same crap as I was that's all you need to do. Save everything external and kill the beast.
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