Cryptolocker is still infecting and encrypting hard drives on a regular basis.
I have written articles on Cryptolocker previously.
Can you stop it running through a software solution ?
You need to backup and my strong advice is a regular offsite backup that is not connected to your computer
Stop opening emails that are not meant for you.
I would also route your email through Gmail as Google appear to be doing a good job at flagging these emails that are causing computers to be infected.