error 1718 when install Visual Studio 2005 Service Pack 1

I tried to install SP1 on Visual Studio 2005 on a very powerful server. It takes quite a lot of time to get it going. however when I thought it was almost over, it shows an error:

“Error 1718, file:xxxxxxxxxx.msp was rejected by digital signature policy”

Looked the error code from Google and I noticed Heath Stewart has documented this problem with a wonderful solution:

that is Set the DWORD registry value PolicyScope to 1 in the HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsSaferCodeIdentifiers registry key. if this DWORD entry does not exist, create it. Do not forget to reboot your computer after changing the registry. Then installing SP1 again will not show the error.

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