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Hi all,
I ran across an article about CryptoLocker. There’s instructions for helping to block this nasty little bugger — as well as caveats.
http://windowssecrets.com/top-story/cryptolocker-a-particularly-pernicious-virus/
I hope this might help.
Regular backups and Limited account are the best protection 
What about HitmanPro’s CryptoGuard as an universal sokution against ransomware?
See downloadsite: http://www.surfright.nl/en/cryptoguard
CryptoGuard works at the file system level and does not conflict with full disk encryption software like BitLocker, Sophos SafeGuard or TrueCrypt.
polonus