Hi, the registry tweak to hide the Themes tab can be found here. If you want to restrict the users to change the visual style, color or size, you can look here. Edit1: You might want to check out the registry key of the second setting. It contains settings to hide tabs from the Display Properties, or to disable access to the Display Properties completely (it even has settings to disable access to the registry and task manager). Edit2: I know I'm a bit late with this, but I found the registry key which tells Windows what name and URL to use for the online themes. here it is: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\DownloadSites\100] "DisplayName"="@themeui.dll,-2015" "URL"="http://go.microsoft.com/fwlink/?LinkId=488" Just remove the DownloadSites key or the 100 key, or you can even change the name and URL to anything you want