drivers

Drivers are specific to the operating system. What one do you have? You can download drivers from Support, Drivers and Downloads. Drivers must be installed in correct order to install properly--very important with older operating systems. Read this-- How to install drivers in order.

http://downloads.dell.com/Pages/Drivers/optiplex-gx620.html

If you have the machine and Base XP installed you can boot an UBUNTU 12.04.2 DVD or higher and via broadband download the files directly to the machine.

http://mirror.anl.gov/pub/ubuntu-iso/DVDs/ubuntu/12.04.3/release/

ubuntu-12.04.3-dvd-i386.iso

XP operating system

thx t will do that

Which drivers Depends on Which OS.

http://downloads.dell.com/Pages/Drivers/optiplex-gx620.html

Chipset - Driver

Description	Importance	Version	Released	Supported OS	Download
ST Microelectronics Trusted Platform Module, v.1.00.04.15 , A00 ST Microelectronics driver XP32 & XP64	Optional	1.00.04.15	8/12/2009	Windows XP Windows XP x64 Windows 2000
Intel Chipset Software Installation Utility, v.8.0.0.1009, A18 Software support for Intel Chipsets.	Urgent	8.0.0.1009	6/25/2008	Windows XP Windows 2000 Windows XP x64
Intel Chipset Software Installation Utility, v.8.1.1.1010, A01 Software support for Intel Chipsets.	Recommended	8.1.1.1010	1/22/2007	Windows Vista 64-bit Windows Vista 32-bit

Audio - Driver

Description	Importance	Version	Released	Supported OS	Download
Analog Devices ADI 198x Integrated Audio, v.5.12.2.7010, A02 ADI 64 Bit Onboard Sound Driver	Recommended	5.12.2.7010	8/23/2007	Windows Vista 64-bit
Analog Devices ADI 198x Integrated Audio, v.5.12.01.7010, A25 ADI Onboard Sound Driver	Recommended	5.12.01.7010	1/25/2007	Windows Vista 32-bit
Analog Devices ADI 198x Integrated Audio, v.4.02.00.0089, A04 ADI 198x Integrated AC97 Audio	Optional	4.02.00.0089	7/12/2005	Windows NT 4.0
Analog Devices ADI 198x Integrated Audio, v.5.12.02.5280, A01 ADI 64 Bit Onboard Sound Driver	Optional	5.12.02.5280	6/27/2005	Windows XP x64
Analog Devices ADI 198x Integrated Audio, v.5.12.01.5246, A23 ADI Onboard Sound Driver	Optional	5.12.01.5246	6/7/2005	Windows XP Windows 2000

It is looking for multimedia audio controller and a sm bus controller. Which drivers are they? Need help

The SM Bus controller driver is part of the chipset software package. The audio controller depends on your audio hardware; if you open up the device properties in Device Manager, you can find out the vendor and device IDs, which will identify the device. (You can find the driver by plugging those values into pcidatabase.com.)

thx t will do that

You're welcome; FYI support for XP is ending in six weeks.