When running Windows Update and installing the SQL Express Update I have received this error on a couple of machines.

Error: “SQL BPA command line has encountered a problem and needs to close

To get the installer to work (and not crash) I had to do this…..

01.) Create a directory C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\BPA\BPAClient

02.) Copy the BPAClient.dll form the C:\Program Files\Microsoft SQL Server\90\Setup Bootstrap\BPA\Bin directory into the directory that you just created

at   then I continued with the install and it worked.

Re-run Windows Update to Install the SQL Server / SQL Express Update.

I have no idea why this works 🙂