Computer wont allow change of display

[green777]

Hi dabhand,
I went to the dell site and downloaded the 2 sets of drivers for the aoo which is the ones for the optiplex, i copied them to a disk and installed them both went into a new directory, but even after that when i tried the properties on the monitor i stll cannot change the settings, it has the place where you click on in but its not alowing me to change it, wont let me go to the monitors driver menu,Any suggestions ?