Dynamics AX 2009 : During Setup of Client an error occurred.

Lors de l'installation du client Microsoft Dynamics AX 2009, l'installation ne fonctionnera pas si Microsoft Framework 4 est installée sur le PC :

RegAsm : error RA0000 : An error occurred inside the user defined Register/Unregister functions: System.ArgumentException: Cannot delete a subkey tree because the subkey does not exist.

[...]

RegAsm : error RA0000 : Could not load file or assembly 'System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

[...]

Install: During Setup of Client an error occurred. Program run: C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe.  

La solution la plus rapide est de désinstaller Microsoft .NET Framework 4 via les Programs and Features de Windows 7 ou Add/Remove Programs de Windows XP. Ensuite, relancer l'installation.