Error Message: CAPI: The Install Failed. The Rsabase.dll File That Is Being Installed Doesn't Match... (263178)

The information in this article applies to:

Microsoft Internet Information Server 4.0

This article was previously published under Q263178

We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx

SYMPTOMS

When you try to install Windows NT Service Pack (SP4) as a prerequisite to the install of the Windows NT Option Pack (NTOP), the following error message may occur:

CAPI: The install failed. The rsabase.dll file that is being installed doesn't match the signature file or the value in the registry.

CAUSE

This is caused by a version mismatch in the Rsabase.dll and Rsasig.dll files. This version mismatch can occur by installing Internet Explorer 5, re-applying SP4, and then installing the NTOP.

RESOLUTION

The correct file versions for the service pack can be obtained from the Microsoft DLL Help database at the following location:

http://support.microsoft.com/dllhelp

When you have the correct file versions, rename the incorrect file, copy the correct version from the service pack media, disable (uncheck) the "Read Only" attribute (if applicable), and then re-apply the service pack.

MORE INFORMATION

For the proper installation order for IIS 4.0, please see:

http://support.microsoft.com/support/iis/install/install_iis4.asp

If you are installing Site Server, please see:

http://support.microsoft.com/support/siteserver/install/install_ss3.asp

Modification Type:	Minor	Last Reviewed:	6/23/2005
Keywords:	kbpending kbprb KB263178