Very unlikely, I would have thought to be a processor, video card or other hardware issue. Most likely software issue or conflict.
First thing in these situations is to download the update locally, disable all startup programs inc Antivirus and 3rd party services. Disconnect from the Internet, restart and run the update from the download.
Usually works 95% of the time.
Are these 4, all your PC's? If so, what software/services are running that is common on all machines?

Must be a nightmare to test Windows Updates as no 2 PC's (once the user has played with them for abit) will ever be identical. All will have various setups and configurations different to the next person

In reply to a post by bobble_bob:

Must be a nightmare to test Windows Updates as no 2 PC's (once the user has played with them for abit) will ever be identical. All will have various setups and configurations different to the next person

They go through a fairly rigerous testing process at Microsoft. So far the only Windows Update that ever affected me was a patch for the .NET 4 Framework affected SCCM 2012 on a server running Windows Server 2008 R2. It took Microsoft a few days to fix the issue so in the meantime had to uninstall the update.

Considering how many times I've done Windows Update and on how many machines, that is not bad going really.

Maybe all the users on this forum who seem to experience issues every month on multiple machines are just unlucky, eh?....

Out of interest how are security issues found? Are they found internally so they can be patched, or do MS take the Google approach and offer rewards for people who find security flaws?

Both. But they don't offer a reward. After all, it's in everyone's interest to get bugs squashed. You can report vulnerabilities here: https://technet.microsoft.com/en-us/security/ff85209...

In reply to a post by bobble_bob:

Out of interest how are security issues found? Are they found internally so they can be patched, or do MS take the Google approach and offer rewards for people who find security flaws?

I think more than half are found externally but often by the larger companies and security bods, rather than individuals just happening to come across the issues, but that also can happen too. Any major exploits being seen in the wild will result in an out-of-band patch.

Some good linsk here:

https://technet.microsoft.com/en-us/security/cc30858...
https://technet.microsoft.com/en-us/security/gg30915...
https://technet.microsoft.com/en-us/security/ff85209...