今天装SQL server 2005遇到了这个 错误，这样解决的：

 

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 :)