You can continue to use the version you have after your 1-year subscription has expired. A trojan is an extremely destructive type of virus, which gives access to your passwords, love letters and hard disc to the offender. PDG finds and destroys trojans. One of the most important functions is that trojans already running can be detected and deleted. A huge database on trojan process allows PDG to find running trojans The registry.
Most trojans pretend to be system files, trying to escape the scan.
All the files on your hard drive. Yes you do, if you connect to the Internet. Most trojans use the Internet as a way of self-distribution. But trojans are more dangerous and destructive. PDG is specially designed to eliminate trojans.