Get the latest install media
1 Windows 10
Head to www.microsoft.com/ software-download/windows10 and click ‘Download tool now’. Once downloaded, open MediaCreationTool.exe. When prompted, select ‘Create installation media’ and follow the prompts to create either a USB flash drive or an ISO file (for burning to DVD).
2 Windows 8.1
Download the Media Creation Tool from www.microsoft.com/softwaredownload/windows8 – input your language, edition of Windows 8.1 and PC architecture (32-bit or 64-bit) and then click Next. Choose to create either a USB flash drive or an ISO file and then follow the prompts to the end.
3 Windows 7
Go to www.microsoft.com/ software-download/windows7 and enter your product key – choose a 32-bit or 64-bit version as required. Once downloaded, double-click the file to burn to DVD, or use the Windows USB Download Tool (https://wudt.codeplex.com) to create a USB flash drive.