Finally, I found a sollution with Dell Driver. 
Note: this screenshots is from Windows 7, but in Vista, is same process to install driver.
Look, if you open your .inf file of SoundMax AD1888 x64 for XP, and search for "Ad1888": not found, but:
[Odm.AddReg]
;Apply for AD198x codecs. Ability to swap control and data.
And AD1888?
ASUS not provide a especify driver for Sound Cards...
But, i found a driver in Dell site to 64-bit systems, Warns that Windows can not verify that the driver is compatible, I forced install driver!
Download: SoundMax AD1888 from Dell
Decompress R145149.exe with 7-zip (http://downloads.sourceforge.net/sevenzip/7z465-x64.msi), right click in .exe, Extract files... and place in desktop and name folder to SoundMax
1. Go to Star menu, and type device manager in search box;
2. Click in "Device Manager", open Sound, video and game controllers, right click in driver, and click in UNINSTALL.
3. Restart system...
4. Go to Star menu, and type device manager in search box;
5. Click in "Device Manager", open Sound, video and game controllers, right click in driver, and click in Update driver.
6. Click in Browser in my computer and click in "Let me pick from a list..."
7. Click in Sound, video and game controllers, if not show this, skip this step.
8. Click in button HAVE A DISK, and click in Browser, go to folder SoundMax in desktop, and click in amd64, double-click in smwdmCH5.inf and press OK BUTTON.
9. AD1888 have a 6-channel sound, click in second "SoundMax Integrated Digital Audio" item.
First item: 5 channel
Second: 6 channel CHOOSE THIS FOR AD1888
Third: 7 channel
10. Click in next and confirm if Windows warns incompatibility of driver!
11. Restart PC.
To test your driver, go to start menu, type "sound" in search box, click in "Sound item".
Click in first item and press button configure!
Click in L or R and test sound!
Note: I'm listen music 2 hours ago and no BSODs!
Note: this screenshots is from Windows 7, but in Vista, is same process to install driver.
Look, if you open your .inf file of SoundMax AD1888 x64 for XP, and search for "Ad1888": not found, but:
[Odm.AddReg]
;Apply for AD198x codecs. Ability to swap control and data.
And AD1888?
ASUS not provide a especify driver for Sound Cards...But, i found a driver in Dell site to 64-bit systems, Warns that Windows can not verify that the driver is compatible, I forced install driver!
Download: SoundMax AD1888 from Dell
Decompress R145149.exe with 7-zip (http://downloads.sourceforge.net/sevenzip/7z465-x64.msi), right click in .exe, Extract files... and place in desktop and name folder to SoundMax
1. Go to Star menu, and type device manager in search box;
2. Click in "Device Manager", open Sound, video and game controllers, right click in driver, and click in UNINSTALL.
3. Restart system...
4. Go to Star menu, and type device manager in search box;
5. Click in "Device Manager", open Sound, video and game controllers, right click in driver, and click in Update driver.
6. Click in Browser in my computer and click in "Let me pick from a list..."
7. Click in Sound, video and game controllers, if not show this, skip this step.
8. Click in button HAVE A DISK, and click in Browser, go to folder SoundMax in desktop, and click in amd64, double-click in smwdmCH5.inf and press OK BUTTON.
9. AD1888 have a 6-channel sound, click in second "SoundMax Integrated Digital Audio" item.
First item: 5 channel
Second: 6 channel CHOOSE THIS FOR AD1888
Third: 7 channel
10. Click in next and confirm if Windows warns incompatibility of driver!
11. Restart PC.
To test your driver, go to start menu, type "sound" in search box, click in "Sound item".
Click in first item and press button configure!
Click in L or R and test sound!
Note: I'm listen music 2 hours ago and no BSODs!
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