"Officially no, Dell has not listed this system for Windows Vista or Windows 7 compatibility and as such no drivers are officially available directly on the drivers and downloads page." (Acutally the Vista Drivers were listed but this has become broken)

How does Windows Vista run on legacy systems - Dell OptiPlexTM  GX260s, GX270s, GX280s and GX620s? W...

There ARE Vista Drivers.  No Windows 7 Drivers from Dell.  (Dell Officially Listed this system as Designed for Windows XP/Vista Capable)

You will be Much Happier with the Upgrade Result if you Get 4 Gigs of Ram and

Asus ATI Radeon HD6450 Silence 1 GB DDR3 VGA/DVI/HDMI

The Asus Card is fanless, Silent, and fits in ALL MODELS of GX620 except the USFF.

48 new from $39.93

 

 

Most of the hardware uses Native Windows 7 Drivers with the exception of the Audio Codec.

http://www.dell.com/content/topics/global.aspx/solutions/en/winvista_faqs_rel?c=us&l=en&cs=prem#faq0...

1. Dell will qualify Windows Vista for Basic Windows Vista functionality on the following OptiPlex legacy platforms: OptiPlex GX620, GX520, GX280, SX280, GX270, SX270, 210L and 170L
2. Dell will qualify Windows Vista for Basic Windows Vista functionality on the following Latitude legacy platforms: D800, D600, D400, D410, D505, D810, D610, D510, X300
3. Dell will qualify Windows Vista for Basic Windows Vista functionality on the following Dell Precision Workstation legacy platforms: Dell Precision Workstation 360, 470, 650, 370, 380, 670, M60, M70, M20

To run the premium versions of Windows Vista, including the Windows AeroTM  user interface, PC's should be configured with at least 1GB system RAM and 128 MB graphics memory.

To help further optimize the Windows Vista experience Dell recommends 2 GB dual-channel (2-DIMMs) system RAM, a Dual-Core processor, a 7200 rpm Hard Drive and at least a 256 MB discrete graphics card.

http://ftp.us.dell.com/video/R140545.EXE                         32bit                  Intel Graphics drivers

 

Intel® Graphics Media Accelerator Driver for Windows* 7 64 (exe)

File name:win7_64_1512754.exe
    
Version:15.12.75.4.64.1930     
Date: 10/02/2009     
Status:Latest
Size:22.84 MB     
Language:Multi language
Operating Systems:Windows 7 (64-bit)*, Windows 7 Enterprise, 64-bit version*, Windows 7 Home Basic, 64-bit version*, Windows 7 Home Premium, 64-bit version*, Windows 7 Professional, 64-bit version*, Windows 7 Ultimate, 64-bit version*

Detailed Description

Purpose:

This driver is written specifically for the desktop   Intel ® 945G, 945GZ, 945GC, 945GT, 946GZ, G965, Q963, Q965, G31, G33, G35, Q33, Q35, Express Chipsets and the Mobile Intel®  940GML, 943GML, 945GM, 945GME, 945GMS, GL960, GLE960, GM965, GME965  Express Chipsets and will not function with any other product. View the README file for installation information and the RELEASE NOTES for driver version details. This driver package contains version 15.12.75.4.1930 (8.15.10.1930) for Windows* 7.

Usage:

The software drivers provided on this page are generic versions, and can be used for general purposes. However, computer original equipment manufacturers (OEMs) may have altered the features, incorporated customizations, or made other changes to the software or software packaging they provide. To avoid any potential installation incompatibilities on your OEM system, Intel recommends that you check with your OEM and use the software provided via your system manufacturer.
Intel or the computer original equipment manufacturer (OEM) may not provide technical support for some or all issues that could arise from the usage of this generic version of software drivers.

win7_64_1512754.exe 64bit  Intel Graphics drivers Download

 
Release Date:     1/24/2007        
Version:     A255.12.01.7010        
Importance:     Recommended        
Download Type:     Driver        
File Format:     Hard-Drive        
File Size:     3MB     

R145551.EXE         32 BIT

R145149.EXE          64 BIT

Compatibility

Systems