Security company Trend Micro has published some free tools which claim to be able to remove ransomware from a computer and recover any encrypted files. Not having any infected computers to hand, I've not been able to test these. But it might well be a good idea to add this to your list of things to try if you're unlucky enough to be affected.
You'll find the tools, and details on how to download and use them, at http://www.trendmicro.co.uk/products/free-tools-and-services/index.html and they should work fine with all recent versions of Windows.
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