Problem with ProgramData/Apple directory

When I'm trying to uninstall iTunes,it says at there are a problem with C:\ProgramData\Apple\Installer cache. And I was trying to delete the folder, to see if that worked, but I couldn't delete the folder, because it's protected or something. Please help me with this problem, I would be so glad if someone could help me! :-) PS. I have the same problem with Quicktime :-)