If you expand the location, you will see that they are contained in the virus definition updates folder, which is probably the previous days version.
During the scan, avast has cleaned up the previous defs around the scan called them up, resulting in the error of them not being found.
No Problem, just avast doing some housekeeping and then just telling you why it couldn't scan those files
You'll find that you can't "take any action" but simply to close the scan results, because there is nothing to do
Scott
