what type of ethernet controller does the dell optiplex 620 have i need drivers for the ethernet controller
More aboutdell optiplex configuration
Any drivers you need should be available directly from the Dell website (see support).
You can find the list of installed network adapters using Device Manager. Just run "devmgmt.msc" (no quotes) from the Start->Run field, or any DOS command window, then locate and expand Network adapters.