I am the administrator of a Windows Active Directory domain. Recently (a few days ago), we started having a problem where people that have local administrator permissions on PCs were getting error messages when trying to install software saying they did not have permission.
Testing revealed that this was happening to anyone with administrative permissions, including my domain admin account, but the tricky part is that it only happens if you attempt to install from a CD-Rom. If you install from the hard drive, it works fine (including if you copy the contents of a CD to the hard drive and run the setup program from there -- runs without any problem). I do not know what could have recently changed to make this happen.
This is a Windows Domain with primarily Windows 2003 servers, a few Windows 2008 servers. All client PCs are XP Pro.