Here's a link I found on Dell Support for your monitor. Hope it helps you. http://support.dell.com/support/dow...&dateid=-1&formatid=-1&source=-1&fileid=61062
That is an old monitor, driver dates from 2002.
It states it's for Windows 2000 or XP. There are no Vista drivers for it.
I would recommend that you unzip the executable with either WinRAR or WinZIP or 7Zip. It will make a folder with the "INF" driver files in there.
Point your monitor "Update Driver" to that folder and it may work.
However with that old of a monitor, Windows 7 may just prefer to recognize it as a "Plug and Play" monitor instead.