Microsoft Windows Defender can contribute to linked-clone OS disk growth and increase IOPS in linked clones and full virtual machines. Disable Windows Defender if you install other anti-spyware software on the virtual machine.

If Windows Defender is the only anti-spyware installed on the virtual machine, you might prefer to keep Windows Defender active on the desktops in your environment.


In vSphere Client, select the parent virtual machine and select Open Console.


Log in to the Windows 7 guest operating system as an administrator.


Click Start and type Windows Defender in the Search programs and files box.


Click Tools > Options > Administrator.


Deselect Use this program and click Save.