John Jones wrote:

Overnight, windows re-booted my pc (does p stand for personal or
proprietory to MS?)

Don't know where is this "p" you are asking about. You didn't say where
it appears.

and completed the installation of KB2999226.

https://support.microsoft.com/en-us/...ime-in-windows

That's a runtime (a library of files to support function calls from
programs to perform functions for them). The CRT (C RunTime) in Windows
10 was made available to earlier versions of Windows so program authors
could write code for their Windows 10 app but have them also supported
in previous versions of Windows. In Microsoft's arrogance, they added
the term "Universal" to call it their Universal C RunTime.

C, VB, and other runtimes have been supplied in Windows for a along
time. That is so programmers don't have to start from scratch building
their own functions, many of them to interoperate with the operating
system, resulting in a mashup of everyone doing it differently. It's
the same reason DirectX is included in Windows so graphics authors don't
have to develop new code for the same functions for their video games.
Unless an author goes rogue or uses assembly, they are using a runtime
in their program whether it be from Microsoft or someone else's library
of functions.

https://en.wikipedia.org/wiki/Univer..._Platform_apps

It is in fact uninstallable, but seems not to cause problems, as far as
I can see so far. I will continue to review the situation (twang).

It was an update. That means you already had the Universal C RunTime
installed in your computer and this was an update to that already
existing installation.

It is not an update to Skype. Don't know why you thought so. Maybe you
got offered an update to Skype and for UCRT.