[Vista Permissions and trusted installer!]

I saw this here on another forum. Also, is in Microsoft's website here http://support.microsoft.com/default.aspx?...kb;EN-US;929833

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1. At an elevated command prompt, type the following command, and then press ENTER:

takeown /f Path_And_File_Name

For example, type takeown /f E:\windows\system32\jscript.dll.

2. Type the following command, and then press ENTER to grant administrators full access to the file:

icacls Path_And_File_Name /GRANT ADMINISTRATORS:F

For example, type icacls E:\windows\system32\jscript.dll /grant administrators:F.

3. Type the following command to replace the file with a known good copy of the file:

Copy Path_And_File_Name_Of_Source_File Path_And_File_Name_Of_Destination

For example, type copy E:\temp\jscript.dll E:\windows\system32\jscript.dll.

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It worked for me