Probleme d'installation microsoft. net 3.5 sp

Bonjour,

j'ai un probleme pour installer net 3.5 sp1 pour pouvoir installer mon logiciel blackberry
ce message s'affiche dans le joiurnal des erreurs

"[06/13/12,09:56:55] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[06/13/12,10:02:28] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[06/13/12,10:05:33] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[06/13/12,11:04:30] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[06/13/12,11:26:01] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[06/13/12,11:43:41] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[06/13/12,12:06:42] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[06/13/12,12:06:44] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.5 'package' is not installed.
merci de m'aider