RE: Dell Optiplex 9020 Windows XP 32bit Drivers
Dell says they don't have a driver and Intel says see Dell.
It is an Intel product. Dell drivers are merely Intel ones rebundled so if Intel don't have then Dell definitely won't. Intel will likely never produce an XP driver again as its a legacy OS.
What I would recommend is to run the unit with Windows 7 or 8.1 and use a XP virtual machine. I would advise using VirtualBox for this.
If you want to try to install a driver go to the Microsoft Update Catalog (use Internet Explorer)
Search for PCI\VEN_8086&DEV_153A (ignore the additional &SUBSYS part)..
There will only be Windows 7 and 8.1 drivers available. So click on a file and check that the architecture matches x86 (32 bit) or x64 (64 bit) depending on what OS you installed. Add to basket and then download.
Once you have downloaded the file, double click the cab file on the desktop to open it. Copy the 7 files to the desktop
Right click the file with the cog and select install.
open up device manager and right click the network adapter with the (?) and hardware ID and select update driver, select the folder you downloaded the Windows 7 driver and see if you can get a driver installed.
Tech Enthusiast and Author of the Unofficial Dell Windows Reinstallation Guide