There are two ways to run Control Panel as an administrator in elevated mode in Windows 11/10: Open Control Panel in Elevated Mode using Shortcut Open Control Panel in Elevated Mode using Run Let ...
Since Microsoft is phasing out the Control Panel applets and trying to move them over to the Settings app gradually, the System applet too appears to have gone missing in Windows 11/10.
See if your Windows 11, 10, 8, 7, Vista, or XP install is 32-bit or 64-bit ...