Well, I have encounter this lately. I was about to save on windows or program files folder but it is on write protect mode. I'm using an admin account which is our default account. But the IT did something on our station. So I can't hide my media files and I can't find the settings. Did I miss that settings, I can't find it on services.msc and gpedit.msc. Btw, I can install some programs but I can save some files. Which I mean Installer are valid but other files are not.