System environment variables are predetermined settings that Windows uses to help configure applications, the operating system, and system hardware components. Windows stores all system environment variables in the Windows registry.
The most common way to modify an existing system environment variable is through the Control Panel. Here are the steps to do it:
1. Open the Control Panel. To do this, go to the Start menu and type “Control Panel” into the search box. Then, select the “Control Panel” icon from the list of results.
2. Select “System and Security”.
3. Choose “System” from the list on the left side of the window.
4. Click the “Advanced system settings” link.
5. On the System Properties window, select the Advanced tab and click the “Environment Variables” button.
6. In the Environment Variables dialog box, select the system variable you want to edit and click Edit.
7. You can now modify the value of the selected system environment variable.
8. When you are done, click OK to save your changes.
9. Close the System Properties window and the Control Panel window.
Your changes will take effect immediately but you may need to restart your computer for them to become active.
You can also modify system environment variables using the Command Prompt or PowerShell. However, these methods should only be used by advanced users as any mistakes made can cause serious issues to your system.
In conclusion, modifying system environment variables is a relatively easy task with the Control Panel. Simply open the Control Panel and follow the instructions above to modify an environment variable. Once you have finished, the changes will take effect immediately but you may need to restart your computer for them to become active.