Next time I recommend the use of Sandboxie for your daily browsing. I bet you catch the cryptomalware via drive-by download or exploit, either way Sandboxie protects you.
These files will remain locked forever. If you have the proper files (you think, that they are clean), copy them somewhere else, rather than a computer. And then make your computer completely clean and install Windows again (only clean installation) and think about it seriously, where did you get this encryption program on your computer. Otherwise, you get it back soon.