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Use this method if you want to turn off (either temporarily or permanently) your PC's ability to connect to a wired or wireless network. The steps to open Control Panel vary by Windows version:   Windows 10 or 8: Press ⊞ Win+S to open the search bar, type control panel, and then click Control Panel in the search results.  Windows 7, Vista, and XP: Click the Start menu and select Control Panel. The option you see varies by PC. It's in the left panel. A list of your network adapters will appear. A menu will expand. This adapter is now inactive and will remain so until you re-enable it. To re-enable the connection, right-click the connection and click Enable.
Open the Control Panel. Click Network and Sharing Center or View network status and tasks. Click Change adapter settings. Right-click the adapter you want to disable. Click Disable.