I heard reports of a new piece of malware that is going around. This one is particularly nasty, It Encrypts all of the data on your drive and mapped network drives with a RSA 256 bit AES key. Once encrypted there is no way to decrypted. The only way to get the files back is from an off site backup (because if the backup drive is local it also gets encrypted) or to actually pay them the money in which they apparently decrypt your data.
Source... Crypto Locker - Virus, Trojan, Spyware, and Malware Removal Logs
Play it smart ... make regular backups of your system!!!