"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?

https://web.archive.org/web/20101124020521/http://www.dell.com/content/topics/global.aspx/solutions/en/winvista_faqs_rel?c=us&l=en&cs=prem

 

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

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

https://downloadcenter.intel.com/download/29370/Intel-Graphics-Media-Accelerator-Driver-for-Windows-7-64-exe-

This download is valid for the product(s) listed below.

• Graphics Drivers for Intel® 82945G Express Chipset
• Graphics Drivers for Intel® 82946GZ Graphics Controller
• Graphics Drivers for Intel® 82G965 Graphics and Memory Controller Hub (GMCH)
• Graphics Drivers for Intel® 82Q963 Graphics and Memory Controller Hub (GMCH)
• Graphics Drivers for Intel® 82Q965 Graphics and Memory Controller Hub (GMCH)
• Graphics Drivers for Intel® G31 Express Chipset
• Graphics Drivers for Intel® G33 Express Chipset
• Graphics Drivers for Intel® G35 Express Chipset
• Graphics Drivers for Intel® Q33 Express Chipset
• Graphics Drivers for Intel® Q35 Express Chipset
• Graphics Drivers for Mobile Intel® 945GM Express Chipset Family
• Graphics Drivers for Mobile Intel® 965 Express Chipset Family

    
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

 

 

Dell Recommendations

	Basic Windows Vista Experience - No Aero	Windows Vista Aero Experience	Optimized Windows Vista Experience
	GOOD	BETTER	BEST
System Memory	512MB RAM	1GB RAM4	2GB Dual Channel4 (2 DIMMS)
Graphics Memory	Integrated or discrete	128 MB Graphics Card (integrated or discrete)2	256MB Graphics Card
Processor	modern processor (>800MHz)	1 GHz 32-bit (x86) or 64-bit (x64)	Dual-Core
Hard Drive	>15GB free (recommended)	40GB capacity, >15GB free	7200 rpm
Window Vista Aero Experience	None	Aero enabled as a default, but performance may be compromised as more windows, applications and games are opened.	Can enhance Aero experience and system performance
Great for...	Booting the Operating System, without running applications or games	Multitasking (e-mail, basic photo editing, basic video editing, music, spreadsheets, browsing, and other applications) The experience is only assured in single monitor mode. Dual monitor is supported, but may affect the aero premium experience.	Multi-tasking with power-hungry applications (large spreadsheets, advanced video and photo editing, HD viewing and recording) Dual Monitor Usage

b) Systems without a Windows Device Driver Model (WDDM) will not run Aero. The following systems do not have WDDM support, but can provide Basic Vista functionality with at least 512 MB System RAM:

c) OptiPlexTM GX280, SX280, GX270, SX270, 210L and 170L,

LatitudeTM  D800, D600, D400, D410, D505, D810, D610-integrated, D510, X300 and Dell PrecisionTM  Workstation 360, 470, 650, 370, 380, 670, M60, M70, M20.

d) Although Dell plans to fully test Windows Vista on the following platforms to help ensure Basic Windows Vista functionality, Dell will not provide any required changes to BIOS or drivers to enable full Windows Vista functionality (such as AeroTM  ) on these legacy systems

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 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 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

e) To run the premium versions of Windows Vista, including the Windows AeroTM  user interface, PC's should be configured with at least 1GB system RAM1 and 128 MB graphics memory2

f) To help further optimize the Windows Vista experience, (with Microsoft Office 2007) Dell recommends 2 GB dual-channel1 (2-DIMMs) system RAM, a Dual-Core processor, a 7200 rpm Hard Drive and at least a 256 MB discrete graphics card2.

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6) Will Windows Vista be factory loaded on OptiPlex GX620?
a) Windows Vista will not be an available OS OEM option on the OptiPlex GX620 as this product will end of life in January. The follow on replacement product, the OptiPlex 745 is available with both the Windows Vista and Windows XP operating system options.