IE9 Disable AutoComplete for Forms Registry Setting (where is it?)

Question

I have tried with no success to use GP to consistently force Disable AutoComplete for forms (User Configuration\Administrative
Templates\Windows Components\Internet Explorer).
Using GPResult,
some workstations show "disabled" when the setting is actually "enabled" through GP. 
I am now pursuing a registry edit to force this to my workstations
consistently (key word; consistently). Does anyone know the correct registry key for IE9 on a Windows 7 Pro (64 bit OS)? I've tried about five so far and none of them work. 
So far, I've tried:
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\AutoComplete]
"Append Completion"="no"
HKCU\Software\Microsoft\Internet Explorer\Main\WindowsSearch\AutoCompleteGroups REG_DWORD "0"
and a few more I forget... 
I am supposing that a Microsoft support person will be the only one(s) in the know for this one but please help if you can! 
Charlie Newman

Answer 1

Hi,
As we all know we can disable AutoComplete throung IE settings. While if you want to disable them through Registry, it would be better to use Regshot to caputer registry modifing after this setting changed in IE.
I made a test in my test enviroment, there are some other volume and key modified, also contains:
Eg:
HKU\S-1-5-21-4145364215-115882434-1782034342-500\Software\Microsoft\Internet Explorer\Main\Use FormSuggest: "yes"
Please make a capture in your system.
Roger Lu
TechNet Community Support