This function is called when the “Custom Scan” button is clicked. It displays a notification using NotifyIcon1.ShowBalloonTip, sets the visibility of Progressscan to true, updates the last scan to “Custom Scan”, sets the count and fileCount to 0, updates the text of Labelthreatfound and Labelfilesscanned to 0, opens a FolderBrowserDialog to select a directory or file to scan, and scans the selected path. It also updates the scan duration in Labelscanlasted and displays a notification when the scan is completed.