Microsoft does allow users to download free copies of Windows 7 Home Premium (X64 & X86), in order to replace original installation disks or recovery disks. However, if you want to install Windows 7, you will need to provide a product key which must be purchased. Otherwise, the use of the product is illegal.
You can use the following link to download Windows 7 Home Premium X64, and create a USB or CD installation drive:
Download Windows 7 Home Premium X64 & X86
- Ninja Gaiden
- How to create a Windows 7 installation USB Drive