Bitdefender Anti-CryptoLocker is software that helps protect your machine from these infections by blocking any ransomware that tries to encrypt your information. The program can be configured to start up alongside Windows, and to not interrupt you while you're working on your computer.
The application doesn't need to be installed - just launch it to start protecting your data. Once the program is running, it will open a window in the lower righthand corner of your screen to let you know that it's working properly.
Bitdefender Anti-CryptoLocker is a truly useful option for blocking all kinds of malware, not just this type of ransomware.