Jun 14, 2021 · 1 Press the Win + R keys to open Run, type perfmon into Run, and click/tap on OK to open Performance Monitor. 2 Expand open Reports, System, and System Diagnostics in the left pane of Performance Monitor. (see screenshot below) 3 Under System Diagnostics, click/tap on a report that was created (collected) on the date and time you want to view.