Step 1
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Rimuovi Silverlight dal pannello di controllo e segui le istruzioni di seguiro per rimuovere eventuali "rimasugli"
Step 2
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Remove files related to Silverlight
1. Open C:\Program Files.
2. Find the folder named Microsoft Silverlight and then delete it.
Note: I assume your Windows is installed on drive C.
Step 3
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Remove registry keys related to Silverlight
1. Click Start, click Run, type "regedit" (without quotation marks) in the Open box, and then click OK. The Registry Editor program will come up.
2. Navigate to the following folder in the left pane if it exists.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Silverlight
3. Right click on Silverlight then click on "Permissions...".
4. Please check if Administrators is listed in the Group and User name list. If not, please click the Add button and type "Administrators" in the open window and click OK to add this group.
5. Highlight Administrators and check on Full Control under Accept.
6. Click the Advanced button and choose the Owner tab.
7. Highlight the current user account in the list and mark the check box before Replace owner on subcontainers and objects.
8. Click OK to save changes and wait for the system to transfer the ownership of all the objects.
9. Delete the Silverlight entry.
10. Use the same steps to delete the following entries if they exist:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{89F4137D-6C26-4A84-BDB8-2E5A4BB71E00}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\D7314F9862C648A4DB8BE2A5B47BE100
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\D7314F9862C648A4DB8BE2A5B47BE100
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{DFEAF541-F3E1-4c24-ACAC-99C30715084A}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{283C8576-0726-4DBC-9609-3F855162009A}
11. Please restart the computer and install Silverlight again
