Cannot activate Remote Desktop IP Virtualization on Windows 2008R2

Hello

I am trying to activate Remote Desktop IP Virtualization on Windows 2008R2 but without success.

I followed instructions from here : http://technet.microsoft.com/en-us/library/ee308290(v=ws.10).aspx

And I have this error message in my log : 

La virtualisation IP des services Bureau à distance n’a pas pu charger C:\Windows\system32\TSVIPool.dll. Code d’erreur : 0x80070057.

In english : Remote Desktop IP Virtualization could not load C:\Windows\system32\TSVIPool.dll. Error code: 0x80070002

Source : TerminalServices-TSAppSrv-TSVIP

Event : 114

Does anyone have a feedback about this error message ? I looked online for it but didn't find anything related.

Thanks in advance, 

Thibault

PS : Here is the information from my registry concerning the configuration

Key :          HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\TSAppSrv\VirtualIP

value 0 : 
  Name : EnableVirtualIP  Type : REG_DWORD Datas : 0x1

Value 1
  Name : ComponentDLL Type : REG_SZ  Datas : %SystemRoot%\system32\TSVIPSrv.dll

Value 2
  Name : VirtualMode Type : REG_DWORD Datas : 0x1

Value 3
  Name : AdapterAddress Type : REG_SZ Datas : 00-15-5D-06-3E-08

Value 4
  Name : IPPool Type : REG_SZ Datas : %SystemRoot%\system32\TSVIPool.dll


Name :          HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\TSAppSrv\VirtualIP\IPPool
Value 0
  Name : Start Type : REG_SZ Datas : 10.81.11.100

Value 1
  Name : End Type : REG_SZ Datas : 10.81.11.150

Value 2
  Name : SubnetMask Type : REG_SZ Datas : 255.255.255.128


Name :          HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\TSAppSrv\VirtualIP\PerApp

Name  :          HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\TSAppSrv\VirtualIP\PerApp\cmd.exe
Value 0
  Name : FullPathName Type : REG_SZ Datas : C:\Windows\System32\cmd.exe