I bought a 2 year subscribtion to Avast 4 Pro after my computer was already riddled with trojans. I finally had to have the hard drive reformatted to get rid of the viruses, but unfortunately I lost the email with the license key, so now I am back to having the free home version. Can I get the professional version back? I registered again, and put a message in that I had lost the paid-for version, but the reply was automated and sent a license key for the home version.