File system modifications
Certain locations are only accessible to users with administrative privileges such as: C:\Windows, C:\Windows\System32, Program Files and any files that are part of the Windows Resource Protection (WRP). Windows Vista or later also prevents files from being written to the root of the C:. When UAC is On, both standard user accounts and users that are members of the Administrators group will fail. When UAC is Off, only members of the Administrators group will succeed. This affects actions such as File.Copy, File.Install, System.RegisterActiveX etc.