SoundMax Digital HD

It sounds like you are missing the motherboard chipset drivers and device drivers.  Use the Vista 64 bit drivers as they are also Windows 7 compatible.

Although Win 7 will install many drivers (some will be non-Dell drivers and Dell drivers are needed) the install sequence is (1) Install Windows (2) Install Dell Desktop System Software (3) Install Motherboard Chipset Drivers - there are 4 listed for this model (4) Install Device Drivers including Video, Dell Sound, Ethernet, etc. 

The chipset drivers MUST be installed before installing device drivers. 

Dell Downloads for Vista 64 bit

Would youe guide me more detail. Here what I did but stil failed: (1) uninstalled the soundmax driver, (2) installed the chipset (OK), (3) reinstall soundmax (failed). Where I can get the dell dekstop system software. Do I have uninstall something else first?. Thank you

Thank you. after follow your suggestion by uninstalling audio, chipset, video drivers, and reinstall chipset driver then audio. the audio is working now, but the PCI driver still won't work, with some error message "window could not find driver software for your device".  BTW, where I can get the dell desktop system software? Thanks

I took the following from the Optiplex 760 (Windows 7 64 bit).

Dell Desktop Software* (Under System utilities), 3 Chipset Drivers**, Intel Video, ATI*** & nVidea***, 4 Conexant Modem Drivers, 2 Ethernet Network Drivers, 1 Audio Driver.

* I can't remember if it installed, I think it did.
** I took one additional one from the 755 page R205428.exe, not sure if it said I had a later version already installed or not.
*** Get direct from their perspective websites. 

I wrote this out in more detail but it came up error and I lost all I wrote. Sorry. However this driver set works. The conexant drivers should be installed before the audio but the order isn't as critical in Windows 7. Installing them will likely fix your error.

R164900.exe

Systems

Operating Systems Windows Vista 32-bit Windows Vista 64-bit

The "PCI serial port" Is the intel driver.  There is a one size fits all set for All Windows that addresses this.

Chipset, then the HECI and SOL drivers.

The AMT AND HECI Drivers I believe are under chipset.

Also the Newest Version of the drivers seem to Apply to All Windows AKA XP, Vista, WIN7

With the Newer Files you don't need to jump thru hoops for.

One Size Fits all.

Operating Systems

Windows 7 32-bit

Windows 7 64-bit

Windows Vista 32-bit

Windows Vista 64-bit

Windows XP

Windows XP x64

Chipset

ftp.us.dell.com/.../R174616.exe

HECI

ftp.us.dell.com/.../Intel_AMT-HECI_A02_R255437.exe

SOL

ftp.us.dell.com/.../Intel_AMT-SOL--LMS_A02_R255438.exe

Hard Drive Installation (via WinZip) with Setup.exe File for Intel_AMT-HECI_A02_R255437.exe

Download

1.Click Download Now, to download the file.

2.When the File Download window appears, click Save (Windows XP

users will click Save) this program to disk and click OK.  The Save In:

window appears.

3.From the Save In: field, click the down arrow then click to

select Desktop and click Save.  The file will download to your desktop.

4.If the Download Complete window appears, click Close.  The file

icon appears on your desktop.

Install

1.Double-click the new icon on the desktop labeled Intel_AMT-HECI_A02_R255437.exe.

2.The Self-Extracting window appears and prompts you to extract or

unzip to C:\DELL\DRIVERS\R255437. Write down this path so the executable (I.e.

Setup.exe) file can be found later.

3.The Self-Extractor window appears.

4.Click OK.

5.After completing the file extraction, if the Self-Extractor

window is still open, close it.

6.Click the Start button and then click Run.

7.Type C:\DELL\DRIVERS\R255437 in the Open textbox and then click OK.

8.Follow the on-screen installation instructions.          

Thank you, it it works using the R205428.exe Chipset driver

Oops.. after installed the Intel_AMT-SOL--LMS_A02_R255438, there are no error on the device manager (nor audio and PCI serial port). However, when I restart the computer, the internet won't work. I have to "open network and sharing center", then "LAN" then "disabled:", and run trouble shooting and fix as administrator, window diagnostics fix the problem. However, when I restart again, .... the no internet .... I have to do disabled LAN, trouble shooting, before I can write this message. Please help

Reinstall the sound driver if problem persist ..check the cable