I downloaded and installed the latest version (4.

of Avast! antivirus home (free edition) on Monday, and something in the help guide confused me.
I assumed that running a Thorough Scan on all local disks would check for all malware known to Avast!, but read this in the help system:
avast! Virus Cleaner is a tool that will remove selected viruses from your computer. While avast! itself is able to detect and delete almost all known viruses, avast! Virus Cleaner can handle only a small selection of the most common ones. The list can be displayed (in the avast! Virus Cleaner tool) by clicking on the "About" button.
So when I run a Thorough Scan, am I using the "virus cleaner" database or the full Avast! database? If it is the former, how do I scan with the full database?
Thanks in advance.