The latest VirtIO drivers dropped support for Windows 7 at version v0.1.173-4. Using newer driver versions will result in installation failures or missing drivers. Always download the v0.1.173-4 version from the Fedora People archive for Windows 7 compatibility.
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: Windows 7 does not include VirtIO drivers by default. For better disk and network performance, you should load the VirtIO-Win ISO during installation. The latest VirtIO drivers dropped support for Windows