Check Link: https://support.microsoft.com/en-us/kb/3050265



Fixes that are included in this update
This update addresses an issue in which system performance can be decreased during scans. This issue has the greatest effect on computers that have a small amount of physical memory.
This update addresses an issue in which Windows Update scans can fail and generate a 0x8007000E error.
General improvements are made to support upgrades to a later version of Windows.
This update installs a new Group Policy object that enables you to block upgrades to the latest version of Windows through Windows Update. 

Microsoft is making Windows 10 available for free for one year from the date of availability to Windows 7 and Windows 8.1 customers for non-Enterprise editions. If you have Windows 7 or Windows 8.1 Pro deployed in your organization, Windows 10 will be offered to you. Computers that have this Group Policy object enabled will never detect, download, or install an upgrade to the latest version of Windows. 

You can configure this Group Policy object by using Group Policy (if the update is installed and if you use the updated WindowsUpdate.admx file by copying the file from where the editing policy is located). You can also do this by going to Computer Configuration > Policies > Administrative Templates > Windows Components > Windows Update, double-clicking Turn off the upgrade to the latest version of Windows through Windows Update, and then clicking Enabled. 

Policy path Computer Configuration / Administrative Templates / Windows Components / Windows Update

Policy setting Turn off the upgrade to the latest version of Windows through Windows Update (enabled or disabled)

To suppress this offer through the registry, set the following registry key:
HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DWORD: DisableOSUpgrade = 1