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You cannot "upgrade" a 32-bit installation to 64-bit directly; you must create bootable media: Download ISO : Obtain the Windows 8.1 64-bit ISO from Create Bootable USB : Use a tool like the Windows USB/DVD Download Tool or Rufus to flash the ISO onto a USB drive (at least 8GB). 3. Perform the Clean Installation Boot from USB
Right-click the hardware device, choose Update Driver Software , select Browse my computer for driver software , and select the extracted folder. ⚠️ Important Considerations for Windows 8 Users sxsi x64 windows 8 best