We talked about Cryptolocker last Thursday and I promised for information on this nasty piece of malware that currently even the best virus protection cannot help you detect.

It is your data this charmer attacks and once it has managed to encrypt your documents and images they are almost certainly 'lost', so get organised with your backups straight away!
Read the attached article carefully and follow the advice.
I would add the two attached PDF files are NOT infected (SEE: “How would my PC get infected” on page 2)