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    1. Right-click on a My Computer icon
    2. Click Properties
    3. Click Advanced system settings from the left nav
    4. Click Advanced tab
    5. Click Environment Variables button
    6. In the System Variables section, select Path (case-insensitive) and click Edit button
    7. Add a semi-colon (;) to the end of the string, then add the full file system path of your PHP installation (e.g. C:\Program Files\PHP)
    8. Keep clicking OK etc until all dialog boxes have disappeared
    9. Close your command prompt and open it again