My Dell XPS400(Dimension 9150) came with a Pentium D 940 Processor, which is capable of operating at either 32-bit or 64-bit. Imagine my surprise (disgust) when I learned that Dell does not have the necessary drivers for my computer to run the 64-bit version of Windows 7! Dell sells a computer that has a processor that can handle either 32-bit or 64-bit data and makes a conscious decision NOT to support the 64-bit capability of the Pentium Processor. Can someone at Dell explain this stupid decision?
When you purchased this system did it have Windows XP or Windows Vista installed on it? It would seem to have been designed with XP/Vista in mind, and regardless of the processor, may not be fully able to fit with Windows 7 or the next iteration of the Windows operating system.
Did you review if your system was fully compatible with Windows 7? Here's a link from support.dell.com that assists customers in knowing whether their system is fully compatible with Windows 7: http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&cs=19&l=en&s=dhs&docid=DSN_360683&isLegacy=true
Was this system purchased directly from Dell or from an authorized Dell reseller?
I didn't see a specific driver on the Intel support web site for this processor. I'd be careful downloading drivers from a non-Dell web site. I noted that you've asked pretty much the same questions on the Dell support community forum, so I'll hold off recommending that option.
I know it's been frustrating, but good luck in your quest.
Optiplex Optiplex L755 USFF Windows Vista Business
Macbook Pro OS X 10.8
The computer was purchased direct from Dell with Windows XP installed. Intel tells me that the processor is fully capable of running Windows 7 64-bit, but said that I needed to check with Dell regarding graphics, audio, and chipset drivers. So it seemed like a simple fix - just download the drivers that support windows 7 64-bit, which I thought there would be because Dell must have drivers for their other 64-bit computers and this computer has 64-bit capability. At this point I just see Dell as incompetent!
I don't work for Dell now, but I have worked on the manufacturing side with Dell years ago. My comments are not meant to reflect current Dell Premier personnel thoughts...
Dell will support its products only up to a certain point. Just as Win98 or Windows 2000 are not supported, on your particular system (built somewhere between 2006 and 2007, perhaps) Windows 7 was probably never meant to be supported either. Regardless of whether your processor can handle it or not, Dell is not going to provide drivers or a BIOS update for an operating system that is incompatible for this system. I know this is frustrating to you and does not resolve your issue. Your system was designed to work with XP and Vista only. Drivers for any other operating system are not going to be provided, and wouldn't be provided by other manufacturers for that matter.
If you're being prompted by Intel to install 3rd party drivers on your system... buyer beware.