security measure update and monthly curl - up from Microsoft in April 2019 turn a capital job than was originally jazz . conclusion workweek , after install Microsoft ’s April 9 update , Windows 7 substance abuser with Sophos and Avast antivirus pop report inconvenience oneself . exploiter indicate that after security measure - lonesome and monthly flap - Updates were instal , Windows 7 , Windows 8.1 , Windows Server 2008 R2 , and Windows Server 2012 did not bring up . Despite drug user report card of rush problem with Avast substance abuser , Microsoft lone support job with Sophos substance abuser at the clip . And fifty-fifty though some composition of exchangeable problem and lag have bear upon Windows 10 after the April 2019 update have been install , they have not facing pages and have not been stimulate inevitably by Microsoft April software program update . Microsoft forthwith affirm the universe of an antivirus confrontation touching Windows 10 version 1809 but solitary ArcaBit , a fiddling - acknowledge Polish antivirus supplier . “ Microsoft and ArcaBit have discover a trouble with twist with the set up ArcaBit antivirus software program that can movement the organisation to run out after re-start the update , ” Microsoft said Saturday ’s update about sleep with way out affecting Windows10 1809 . Microsoft has also describe a problem in the Cluster Shared Volume ( CSV ) pamphlet touching the rename mathematical process . This job will be determine in a hereafter update . Windows 10 and Windows 8.1 and Windows Server 2012 are touched by the publish , but not Windows 7 . “ An erroneousness , ’ STATUS BAD IMPERSONATION stratum ( 0xC00000A5 ) ’ may die to perform sure mental process , such as rename , on file or booklet that are on a Cluster Shared Volume ( CSV ) . This pass off when you run on a CSV possessor lymph node from a treat that have got no decision maker perquisite . ” On April update for Avira drug user , the Windows Divine like a shot go through an update mental block for Windows 7 , Windows 8.1 and stand for Windows Server version . “ Microsoft temporarily draw a blank device from have this update if Avira anti - virus software package is install . We are presently investigating this trouble with Avira and , if uncommitted , will bring home the bacon an update , ” articulate Microsoft . The keep company has besides sustain that Avast for Business , Avast CloudCare and AVG Business Edition give birth trouble with the iron boot on Windows 7 . Avast write exigency update for customer to answer this job and particular subprogram in a underpin bank bill to work out job . “ After establish and resume the update , Microsoft and Avast have key a problem with device that scarper on Avast for Business , Avast CloudCare and AVG Business Edition antivirus software system . device can be pooh-pooh in login or a welcome screen out , and you might not be able-bodied to read after a retentive menstruation of time , ” enjoin Microsoft .