You can easily see which updates have been installed and when, because in all Windows version, there is an update history available. Here, with the below steps, you can easily see updates installed on your Windows PC easily.
In Windows 10:
Select the Start button and then select Settings and then Update & Security. After this selection is made, you can select Advanced Options and then View your update history.
In Windows 8.1:
Simply open Windows Update by swiping in from the right edge of the screen or if you are using monitor the point to lower-right corner of the screen and move the mouse pointer up. After this, select Settings and then Change PC Settings and then Update & recovery. After this selection is made, you can Select Windows Update and then View your update history.
In Windows 7:
Select the Start button and then select Control Panel. Now select programs and then under Programs and Features, select View Installed Updates.