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Just in case anyone is interested in the VT-d saga (described above), my problem-PC has recently stopped being offered the 1803 update.  I take this as evidence that Microsoft have recognised the issue.  Hopefully they are preparing a fix!

Cheers HS

Thanks for your reply columbia2011.  I have run virtual machines on this PC in the past using VirtualBox.  I find it curious that the 1803 update is blocked due to VT-d on some machines.  The problem seems reasonably widespread if you search “Windows 1803 update VT-d”.

Here is a reddit thread for example:

https://www.reddit.com/r/windows/comments/8hiqnf/psa_disable_vtd_in_your_bios_if_windows_1803/

I am not in a hurry to upgrade.  I was posting here more to inform others.  I’ll wait and see if Microsoft provides a fix before I start fiddling around with the BIOS.

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columbia2011

Hi Susan and others

I would like to point out an incompatibility with the 1803 upgrade on some ASUS systems (including one of mine … sigh)

It’s covered fairly well in this thread:

https://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/updating-to-windows-10-version-1803-freezes-on-the/4bc7153c-16cf-4de0-8f8f-7c7d8fe94a56

The symptoms are that the 1803 upgrade process hangs after the first restart.  One is left looking at the windows logo (no spinning dots, no disk activity).  Fortunately a hard reset brings everything back to a login screen.  1803 install fails with error code 0xc1900101.

One solution seems to be turning off VT-d in the BIOS.  (Anyone know what this setting does?).

I think I also found a thread where someone suggested a BIOS update might help.

This may be worth tracking on your list.

Cheers HS