I need Ethernet Controller and a Multimedia Audo Controller for this Dell OPTIPLEX GX260 DHM computer. Ram 512 MB HD 120GB. DL P4 2.27

It will run but if you want smooth full graphics you will need to get a better video card. of course 4 gigs of ram is better then 2 but if you are running 32 bit windows then you are stuck with a max of 3 gigs of ram.

If you have the slim line version then you must buy a slimline card. Be careful ATI cards for some reason on gx260 and gx270's have issues and dont work. You can read about that on the dell support boards.

no you do this in the setup of the cmos. look for a key to hit to enter setup during start up of the computer. sometime it is del and sometime it is an f key. once in cmos setup look for system devices and enable on board graphics. this had to be disabled to use the other graphics card. good luck get back to me if you need more help

Go to dell.com and do a search for drivers for you computer. Dell keeps most of their drivers available for download.

Try downloading some new drivers for the Ethernet, if that doesn't work, try diagnose and repair option in tools.

Here's a list of all the drivers for your OptiPlex
http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=PLX_PNT_P4_GX260&os=WW1&osl=en&catid=&impid

There are a few ethernet drivers for that computer, so you'll need to pick the ethernet controller that is installed.

the ethernet controller is soldered to the board
if it is bad ,go wireless.

http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=PLX_PNT_P4_GX260&os=WW1&osl=en&catid=&impid=

if you don't have the cd with the drivers and utilities, then you can download the drivers online with another computer. (you will need a thumb drive or cd to save it on) you will also need to make sure you know what brand of ethernet card your computer came with. once you get that ethernet card working, you can get online and download the remaining drivers, possibly through windows update. be sure to select custom update, not express, so it will search for the hardware drivers for you.

Ricardo, here is your driver:
http://support.dell.com/support/topics/global.aspx/support/downloads/en/downloads_splash?c=us&l=en&s=gen&~mode=popup&file=58953