"Failed to enumerate host USB devices. Could not load the Host USB Proxy Service (VERR_FILE_NOT_FOUND)..." after upgrading VB v7.1.4 to v7.1.6 in Windows host.

[Ant]

See my ​https://forums.virtualbox.org/viewtopic.php?p=552995 forum thread for the details and comments. Another user had the same problem. I copied and pasted most of my original post below:

In my updated 64-bit W10 Pro. PC host, I just updated my VB v7.1.4 to v7.1.6(VirtualBox-7.1.6-167084-Win.exe). During the upgrade, I noticed my monitor went black and my USB mouse froze a few times. Everything came back to normal after the upgrade was done. I also upgraded my Extension Pack (Oracle_VirtualBox_Extension_Pack-7.1.6.vbox-extpack).

However, starting up my updated VB showed this right away (haven't booted any guest VMs!):

"Failed to enumerate host USB devices. Could not load the Host USB Proxy Service (VERR_FILE_NOT_FOUND). The service might not be installed on the host computer. Result Code: E_FAIL (0x00004005) Component: HostWrap Interface: IHost {d5dcece0-b202-4416-a138-03502784cc07}"

I attached a zip file with my logs. The other user said to reboot the host PC to fix this issue. I can confirm that this fixed it. Installer should had told the users that a reboot is required to complete the upgrade so this issue would go away.

[Ant]

My zipped log files.