: Use the Dell OS Recovery Tool and enter your service tag to download the factory-original image .

If you've previously purchased Windows 7 or have an installation disc and a valid key, you can download a fresh ISO from Microsoft's official site:

Windows 7 remains one of the most beloved operating systems in Microsoft's history. Even though Microsoft officially ended support for the OS in January 2020, many users still seek the Windows 7 Ultimate ISO for legacy hardware support, running older software, or simply out of nostalgia.

Often includes SP1 (Service Pack 1) integrated, saving hours of update time.

Before you start, make sure you have a valid Windows 7 Ultimate license key. If you're upgrading from another version of Windows, ensure your current version qualifies for an upgrade to Windows 7 Ultimate.