This is especially true when Dell has win 8 and 10 compatible drivers bundled (hiding) in a massive Win 7 update package.
Dell Optiplex 790 Pci Serial Upgrade From WinThis trouble occurs when you upgrade from Win 7 which is fully-supported by Dell on these machines, to the unsupported Win 8 or Win 10.
The fix he found for Win 8.1 back in 2014 works perfect for 790 and 990 under Win10. ![]() Do not execute the file package once unzipped Launch Device Manager and scroll down to the yellow trouble triangle over your PCI Serial device Open the device and update drivers by pointing to the unzipped folder you just created. Instead of a malfunctioning device, the Device Manager tree now shows. Since the 790990 also has WDDM 1.0 VISTA drivers then they work from DOS to windows 7 or 8 or 10 just fine. If there are no released drivers for 10 then the vista or 7 or 8 or 10 drivers can be used. GX620 was released in 2006 which is why they started having the made for XP vista Capable label. There is a cost to writing new drivers and systems that are over 5 years old tend to be End of Life End of interactive support. EOL EOS. This isnt just Dell its also INTEL and HP and Apple and Toshiba and Lenovo and and and. These reseller systems are not supported by Dell because they are past the 5 year System Design Life Cycle. Once Proper CHIPSET drivers are installed then only sound Drivers and sometimes network drivers are needed to get EVERYTHING working. It is recommended that you update bios to latest version BEFORE Trying to install 7 or 8 or 10. I too am a user. The forum is primarily user to user, with Dell employees moderating Contact USA Technical Support Get Support on Twitter DellCaresPro. ![]() The Windows 8 drivers should have worked in 8.1. Pre 2005 you have issues because the CPUS do not support NX or CMPXCHG 128 so windows WONT INSTALL on those. Dell Optiplex 790 Pci Serial Windows 7 Drivers FromNo Windows 7 Drivers from Dell. Dell Officially Listed this system as Designed for Windows XPVista Capable). 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. Dell Optiplex 790 Pci Serial Software Drivers ProvidedUsage: 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. Obsolescence is the nature of the business because they must compete with mfrs that do the same. Generic or home-built PCs have no such support, but such hardware is not bastardized (customized) for Dell. The 3rd party mfrs provide their own hardware driver support.
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