Cryptolocker has been in the news for a while, but it is still a threat. There are some things you can do to protect your computer and data.
What is Cryptolocker
Cryptolocker is ransom-ware. It infects your computer, encrypts your files, and then prompts you to pay a ransom in order to get the password to unencrypt them. Reports vary as to whether people who pay the ransom ever get access to their data again, but law enforcement recommends against paying it.