Problema installazione silverlight su XP/Pro

[pc001]

Ciao a tutti ho un problema con silverlight. Ossia alla fine del setup mi ha dato questo errore: 1635
=== Verbose logging started: 21.05.2008 10:17:08 Build type: SHIP UNICODE 3.01.4001.5512 Calling process: f:\temp\ext18866\install.exe ===
MSI (c) (A8:68) [10:17:08:529]: Resetting cached policy values
MSI (c) (A8:68) [10:17:08:529]: Machine policy value 'Debug' is 0
MSI (c) (A8:68) [10:17:08:529]: ******* RunEngine:
******* Product: {89F4137D-6C26-4A84-BDB8-2E5A4BB71E00}
******* Action:
******* CommandLine: **********
MSI (c) (A8:68) [10:17:08:529]: Client-side and UI is none or basic: Running entire install on the server.
MSI (c) (A8:68) [10:17:08:529]: Grabbed execution mutex.
MSI (c) (A8:68) [10:17:08:545]: Cloaking enabled.
MSI (c) (A8:68) [10:17:08:545]: Attempting to enable all disabled priveleges before calling Install on Server
MSI (c) (A8:68) [10:17:08:545]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (s) (6C:74) [10:17:08:545]: Grabbed execution mutex.
MSI (s) (6C:60) [10:17:08:545]: Resetting cached policy values
MSI (s) (6C:60) [10:17:08:545]: Machine policy value 'Debug' is 0
MSI (s) (6C:60) [10:17:08:545]: ******* RunEngine:
******* Product: {89F4137D-6C26-4A84-BDB8-2E5A4BB71E00}
******* Action:
******* CommandLine: **********
MSI (s) (6C:60) [10:17:08:545]: Machine policy value 'DisableUserInstalls' is 0
MSI (s) (6C:60) [10:17:08:592]: End dialog not enabled
MSI (s) (6C:60) [10:17:08:592]: Original package ==> C:\WINDOWS\Installer\b7ced4e.msi
MSI (s) (6C:60) [10:17:08:592]: Package we're running from ==> C:\WINDOWS\Installer\b7ced4e.msi
MSI (s) (6C:60) [10:17:08:607]: APPCOMPAT: looking for appcompat database entry with ProductCode '{89F4137D-6C26-4A84-BDB8-2E5A4BB71E00}'.
MSI (s) (6C:60) [10:17:08:607]: APPCOMPAT: no matching ProductCode found in database.
MSI (s) (6C:60) [10:17:08:607]: MSCOREE not loaded loading copy from system32
MSI (s) (6C:60) [10:17:08:623]: Note: 1: 2262 2: File 3: -2147287038
MSI (s) (6C:60) [10:17:08:623]: Note: 1: 2205 2: 3: MsiFileHash
MSI (s) (6C:60) [10:17:08:623]: Opening existing patch 'C:\WINDOWS\Installer\b7ced5c.msp'.
MSI (s) (6C:60) [10:17:08:654]: Unable to create a temp copy of patch 'f:\temp\ext18866\Silverlight.msp'.
MSI (s) (6C:60) [10:17:08:654]: Note: 1: 1708
MSI (s) (6C:60) [10:17:08:654]: Note: 1: 2729
MSI (s) (6C:60) [10:17:08:686]: Note: 1: 2729
MSI (s) (6C:60) [10:17:08:686]: Product: Microsoft Silverlight -- Installation failed.

MSI (s) (6C:60) [10:17:08:686]: MainEngineThread is returning 1635
Das Patchpaket konnte nicht geöffnet werden. Stellen Sie sicher, dass das Patchpaket vorhanden ist und dass Sie darauf zugreifen können, oder wenden Sie sich an den Hersteller, um sicherzustellen, dass es sich um ein gültiges Patchpaket für den Windows-Installationsdienst handelt.
C:\WINDOWS\Installer\b7ced4e.msi
MSI (c) (A8:68) [10:17:08:686]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (c) (A8:68) [10:17:08:686]: MainEngineThread is returning 1635
=== Verbose logging stopped: 21.05.2008 10:17:08 ===

ho cercato di disinstallare ma non ho trovato nulla.
Avete delle idee in proposito...
mi sono letto anche questi post ma nulla:
http://silverlight.net/forums/t/16419.aspx
Grazie mille a tutti