Samsung has been accused of disabling Microsoft's software and leaving computers open to vulnerability.
Technical expert at Microsoft, Patrick Barker, said he had found Samsung software downloading and running a file called Disable_Windowsupdate.exe.
He said he found the problem whilst helping a user with a computer problem and said a "few Samsung-manufactured computer systems were affected".
In a statement Samsung said: "It is not true that we are blocking a Windows 8.1 operating system update on our computers.
"As part of our commitment to consumer satisfaction, we are providing our users with the option to choose if and when they want to update the Windows software on their products."
According to Samsung the SW update allows users to "download the newest drives, udpates and softwares for your Windows PC".
In a blog post, Mr Parker replied: "I never implied it specifically blocked a Windows 8.1 OS system update, just that their SW Update software is preventing Windows Update from automatically installing updates, and forcing the user to have it set to 'let me choose whether to download and install'.
"It's disabling Windows Update from working as the user intends it to."
He added that if the Windows Update was turned on manually, it was disabled by the Samsung update when the machine was rebooted.
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