The Avast Antivirus program automatically generates a log of all manual and scheduled scans. The log displays the type of each scan, the date it was run and the scan's results. Avast conveniently displays a Show Results button at the end of the latest completed scan so that you can view the scan's results with one click. However, if you want to view the results of a previous scan, you need to access the program's scan logs through the Scan History window.

Step
Open the Avast program, then click "Scan" in the left pane of the window.
Step
Click the "Scan History" link to open the Scan History window.
Step
Select the scan that you want to view from the Completed Scans box. The scan's information is displayed below the Completed Scans box. For example, you can view the number of files that were tested and the scan's run time.
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Step
Click the "Detailed Report" button to view a more in-depth scan report. For example, you can view the names of the files that have errors or were infected. The Detailed Report button is not active for any scan that didn't find any issues.
Step
Click the "Close" button when you finish reviewing the scan logs.