Companies not following Microsoft Documentation, hooking into the kernel using hacks that are the problem. As always, Kaspersky has no problems with this update.Incompatibility with 3rd party AV seems to be the main cause. I wonder if MS rolls out these updates without even testing them.Conflicts between antivirus software and the recent Microsoft April 2019 Patch Tuesday updates are causing Windows 7, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2 to freeze, be unable to boot, or hang on installing updates.www.bleepingcomputer.com
A user posted that he was having problems after the update. He has KIS and MBAM. Users of ESET IS and Norton Security also shared their problems.Companies not following Microsoft Documentation, hooking into the kernel using hacks that are the problem. As always, Kaspersky has no problems with this update.
Windows is Slower After April 2019 Updates According to UsersYet to see any problems on PCs with Kaspersky, can only speak for W10 though.
Normally when a user has an antivirus program, Windows defender will disable its real time protection. It seem for this user at least, Windows Defender is being enabled automatically even though the user had Avira installed on the machine.
Having two antivirus programs performing real-time protection could definitely cause slowdowns and other issues.
At this time there is nothing from Microsoft that states they are aware of the reported issues. The only reference to Windows being slow since the updates is from a support article posted yesterday by Avira that is simply titled "Why does my system run very slow?".
Blame? Didn't those AV companies confirmed the issues?
Windows is Slower After April 2019 Updates According to Users
"It seem for this user at least, Windows Defender is being enabled automatically even though the user had Avira installed on the machine. "
Microsoft Issues Serious Windows 10 Update WarningFreezes in operation are more likely to impact business PCs as it impacts Cluster Shared Volumes (CSVs), though the lock-ups which “may cause the system to become unresponsive upon restart after installing this update” are caused by conflicts with antivirus software. Microsoft calls out ArcaBit, but in TenForums a number of other brands seem to be affected too.