Just trying to Install SBS Premium Edition Add-on specifically the SQL component from the ISO
"SW_DVD9_SQL_Svr_for_Small_Bus_2008_R2_English_MLF_X16-29732.ISO"

Getting this error:

SQL Server 2008 R2 Enterprise setup:

During the Setup Support Files:
Error reading from file D:\1033_ENU_LP\x64\setup\sqlsupport_msi\PFiles\SqlServr\100\Setup\fe72iemr\x64\xtfugnej.dll.
Verify that the file exists and that you can access it.
Click 'Retry' to retry the failed action...

Attempted to resolve it by unzipping the ISO using 7zip and accessing it from a hard disk. But 7zip is complaining of corrupt files.

So I'm downloading a new ISO even as we speak.