Download and install drivers in Windows 8.1 - Microsoft …
https://support.microsoft.com/en-us/windows/download-and-install-drivers-in-windows-8-1-301eaed0-8078-857c-d78d-64f4ded5cdcb
To check that automatic updating is onTo manually install a driverWindows can't verify the publisher of this driver softwareThis driver hasn't been signedWindows requires a digitally signed driver You must be signed in as an administrator to follow these steps.1.Swipe in from the right edge of the screen, and then tap Search. (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Search.) 2.Enter Device Manager in the search box, and tap or click Device Manager.3.In the list of hardware categories, double-tap or double-click the category your device is in and then double-tap or double-click the device you want. For example, to see your video card, tap or click Display adapters, and then double-tap or double-click the video card name.
You must be signed in as an administrator to follow these steps.1.Swipe in from the right edge of the screen, and then tap Search. (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Search.)
2.Enter Device Manager in the search box, and tap or click Device Manager.3.In the list of hardware categories, double-tap or double-click the category your device is in and then double-tap or double-click the device you want. For example, to see your video card, tap or click Display adapters, and then double-tap or double-click the video card name.
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