If you are using a Windows operating system, you can check system files by opening the Command Prompt as an administrator and running the "sfc /scannow" command. This command checks for any corrupted system files and attempts to repair them. Alternatively, you can also access the System File Checker tool through the Windows PowerShell or by using the GUI (graphical user interface) in the Control Panel.
If you are using a Mac operating system, you can check system files by using the Disk Utility application. Open the application, select your primary hard drive, and click on the "First Aid" button. This will scan and repair any errors in the system files.
It is important to note that modifying system files without proper knowledge or expertise can cause serious problems with your operating system. Always exercise caution and back up your files before attempting to modify any system files.