update problems
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Solved by GoodBytes,
Windows update will uninstall all drivers that are not supported in 8.1. You'll have to get the 8.1 drivers for your hardware where the drivers was removed.
It will also uninstall some anti-virus if you don't support the detection of a Windows upgrade process. If it doesn't know the anti-virus or can't uninstall it, it will resume the install, and hope for the best (ie: it will end up with an error at some point, or a broken system, hence why Microsoft always recommends to uninstall ALL security software before the upgrade process)

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