If you've got it, then call Computer Champ on 0430 984 522 to have it removed. This virus is derived from an earlier one called CryptoLocker. Basically, make sure you're backing up your data regularly and removing your external hard drive once done. Be very careful when opening email attachments or clicking on links and watch out for people impersonating other businesses. Have a good antivirus and ensure you're getting Windows Updates. Don't give them any money, because in most cases they won't fix it for you. They'll also put you on their shortlist for future attacks.