Has Avast found a virus? If so, it should be deleted. Normally, putting it in the virus chest confines the virus, but depending on what the virus is, deleting it would be probably be the best thing to do. And, where was the virus found? In memory, in the archives, in the active files, where? More information would be helpful.

The chest and delete the virus it works for me just fine.
The virus is done go to the virus it works for me just fine.
The free home edition what do when virus is move it works for me just fine.

run a compleat scan in safe mode and deleat anything it turns up bad

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