Location of Scan Results

Hello Elton,
You can find the scan reports in the below location,
Windows 10, Windows 8.1, Windows 8, Windows 7, or Windows Vista: C:\ProgramData\AVG\Antivirus\report
Windows XP: C:\Documents and Settings\All Users\Application Data\AVG\Antivirus\report
You can also open the AVG user interface on your desktop, and click the gear icon next to Scan Computer > Select Schedule Scan> report files.
Best regards,
Alok.

Where is information stored about when scans were executed, scan results, etc.?

Hello Elton,
You can find the scan reports in the below location,
Windows 10, Windows 8.1, Windows 8, Windows 7, or Windows Vista: C:\ProgramData\AVG\Antivirus\report
Windows XP: C:\Documents and Settings\All Users\Application Data\AVG\Antivirus\report
You can also open the AVG user interface on your desktop, and click the gear icon next to Scan Computer > Select Schedule Scan> report files.
Best regards,
Alok.