Click on your Avast icon and when Avast screen shows the metallic object run your mouse over it about one third of the way in from the left until you see "Virus Chest" or indeed "Quarantine" and click on it. You'll see the viruses held there. Then do as Pineman100 said
If you right click avast icon in notification area and select 'start avast antivirus' then ,after registry scan,click on the uppermost icon to the right. This will select 'local disk (all non removable disks). Select which type of scan you need and it will scan your hard drive. The other icons are for a particular scan of other drives or folders.
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