Soon after Microsoft released the April 2019 update, Windows users discovered that Windows 7 and 8.1 started to problems.
Many of them started to "freeze", not being able to boot normally and some were too late to start. This has been found to be due to a Windows Update conflict with some antivirus software, such as Sophos, Avast and AVG. Recently added to the list of conflicts McAfee.
In some Microsoft articles last week about Windows 8.1 update KB4493446 and Windows 7 update KB4493472, the company stated that there is also a problem with McAfee's security software, and it causes the same symptoms, i.e. slowermovement or freezing screen.
And while Microsoft says there is an issue with Windows 7 and 8.1 running McAfee software, McAfee claims that these issues also affect Windows 10.
According to McAfee, these problems are due to changes in the service of the Runtime subsystem Client Server, otherwise known as CRSS.exe. And it is not by chance, since Avast confirms CRSS issues, even giving a solution through the registry.