error installing VSTS 2008 SP1

I am installing VSTS 2008 SP1 on Windows Server 2003 R2 32-bit, which has already installed with VSTS 2008 succes开发者_JAVA技巧sfully before. I met with the following error (from install log, at almost the end of install progress from progress bar), any ideas what is wrong?

(IronSpigot::MsiExternalUiHandler::InstallMessageErrorHandler) Returning IDOK. INSTALLMESSAGE_ERROR [Error 1718。File C:\WINDOWS\Installer\35d33.msp Rejected by digital signature policy]

The tag says Server 2003 but the question says 2008...

This is apparently a fix for Server 2003.

http://support.microsoft.com/kb/925336