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Restore your VMs, uninstall the Updates, rollback the changes!
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You are very welcome and I was happy to help.
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My VMs that usually works until last week., but MS update this week managed to break them with the attached error.<br />
This error is the same for all VMs. I am using Oracle Virtual Box &nbsp;5.1.14<br />
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Is there a way to make the VMS run again? if needed to upgrade do I need to run guest additions again?<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/01_w03/1220336/VirtualBox---Error.jpg" target="_blank" class="file-inline" title="error shown when try to start (42 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>VirtualBox---Error.jpg</a>
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VirtualBox---Error.jpg

My VMs that usually works until last week., but MS update this week managed to break them with the attached error.
This error is the same for all VMs. I am using Oracle Virtual Box  5.1.14

Is there a way to make the VMS run again? if needed to upgrade do I need to run guest additions again?

VMs does not work anymore after Windows 10 upgrade this week

Virtual Box

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.