When you don’t have an installation disc of Windows 8.1 it might be very difficult to reach the Advanced Startup Option, this Wiki will guide you through the process of downloading and burning a copy of Windows 8.1.
You cannot use a Windows 8 Retail key to download Windows 8.1, not even if you have upgraded from Windows 8 to Windows 8.1 You will have to download the application for downloading Windows 8. You cannot download Windows 8.1 or 8 64 bits on a 32 bits computer or the other way around, it will always download the same architecture of your current system.
To download Windows 8.1 use this link:http://go.microsoft.com/fwlink/p/?LinkId=271128.
To download Windows 8 use this link:http://go.microsoft.com/fwlink/p/?LinkID=317630.
by Jenefey AaronUpdated on 2021-12-22 / Update for Fix Windows. It happens more often that it should be: your computer is failing you, and you can’t use the CDs or DVD installer because there’s no optical drive.
What can you do to get your back on your feet?
You can use a USB drive to boot or reinstall your Windows. And for today’s tech world, a USB drive is a better solution because we can safely say that almost every computer on earth has USB ports.
If you are ready to get your hands dirty, let’s start. As the title suggested, you need an empty flash drive or any USB storage that you can put your hands on. It should be 4 GB in size if you plan to install the 32-bit version of Windows 8 or 8.1, or 8 GB drive for the 64-bit version. If your drive is not empty, a pre-formatting process is suggested.
Second, you need the Windows 8 or 8.1 installers in the form of DVD or ISO (recommended) along with the product key.
Either you already have it as part of your computer purchase, or you could purchase a new copy. If your installer is in the form of an optical disc, you need to create the ISO version of it.