Navigate to the official Microsoft software download page: https://www.microsoft.com/en-us/software-download/windows7
Enter your valid Windows 7 product key in the box provided. The key must be 25 characters, in the format: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX . download file iso win 7
Choose USB device (recommended) or DVD . Navigate to the official Microsoft software download page:
Browse to your downloaded Windows 7 ISO file. download file iso win 7
Select your language and click Confirm .
Click Verify . Microsoft will validate the key.
Download the Windows USB/DVD Download Tool from Microsoft (still available via archive or major tech sites).