Microsoft .NET Framework

Bonjour, voilà maintenant plus d'une heure que je veux installer ce logiciel pour pouvoir ouvrir enfin Norton Ghost, mais lorsque je l'installe, sa me met qu'une erreur est intervenue... Pouvez-vous m'aider svp?
P.S: Voilà le journal d'erreur:
[04/07/09,16:08:46] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[05/15/09,17:52:48] WapUI: [2] DepCheck indicates Optional Component 'Microsoft .Net Framework 3.0' is not installed.
[05/15/09,18:01:08] WapUI: [2] DepCheck indicates Optional Component 'Microsoft .Net Framework 3.0' is not installed.
[05/15/09,18:10:30] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[05/15/09,17:52:48] WapUI: [2] DepCheck indicates Optional Component 'Microsoft .Net Framework 3.0' is not installed.
[05/15/09,18:01:08] WapUI: [2] DepCheck indicates Optional Component 'Microsoft .Net Framework 3.0' is not installed.
[05/15/09,18:10:30] Microsoft .NET Framework 3.5 'package': [2] Error: Installation failed for component Microsoft .NET Framework 3.5 'package'. MSI returned error code 1603
[05/15/09,18:11:14] WapUI: [2] DepCheck indicates Microsoft .NET Framework 3.5 'package' is not installed.
[05/15/09,18:33:49] WapUI: [2] DepCheck indicates Optional Component 'Microsoft .Net Framework 3.0' is not installed.
[05/15/09,18:44:24] WapUI: [2] DepCheck indicates Optional Component 'Microsoft .Net Framework 3.0' is not installed.
Configuration: Windows Vista
Firefox 3.0.5

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