Your new brought PC comes with pre-installed Windows Operating System in it. But most of the times you won’t get Windows Disc for backup, instead you will get a backup partition inside the computer itself. For many reasons we need a physical DVD disc with operating system like clean installation or you may have to pay more money for a physical Windows 7 setup disk. When you buy a pre-installed Windows 7 PC, you will get a valid installation key, that is all you need, you can legally download Windows 7 with Service Pack 1 from official links below.
Download Windows 7 SP1 ISO
All the download variants below are bootable, Choose your download based on your chipset, i.e, 32-bit or 64-bit.