Try creating a new account, with admin rights, log onto it and attempt to install something.
If it works, you have a corrupt account profile.
If it doesn't, then an Archive and install is in order
Remember to preserve user settings
When I attempt to install a program from a DVD or CD, the process begins normally and then abruptly stops -- that is, a dialogue opens, I enter my password to authorize the installation, the name of the app appears on the menu bar, but then it suddenly quits and returns me to the desktop without actually installing. I'm wondering if the Installer in System=>Library=>Core Services may be corrupted. Any advice on how I might troubleshoot and remedy the problem?
Mac mini 2.26 GHz Intel Core 2 Duo, 4 GB 1067 MHz DDR3, Mac OS X (10.6.1)