On servers that have been upgraded from ISA Server 2000 to ISA Server 2004, an ISA Server 2004 service pack installation may fail, and event ID 10005 is logged in the Application log

You try to install any ISA Server 2004 service pack on a computer that has been upgraded from Microsoft Internet Security and Acceleration (ISA) Server 2000 to ISA Server 2004. However, the service pack installation may fail, and the following event is logged in the Application log:

Event Type: Error
Event Source: MsiInstaller
Event Category: None
Event ID: 10005
Date: Date
Time: Time
User: Not applicable
Computer: ComputerName
Description:
Product: Microsoft ISA Server 2004 -- Upgrading ISA Server 2000 Gatekeeper H.323 Service and its Management Tool is not supported. Please uninstall this version using the Add/Remove Programs applet, and then install the later version from the ISA Server 2004 CD, Support folder.

Note This issue typically occurs when you use the ISA Server 2004 installation wizard.

This issue may occur if the ISA server upgrade process cannot perform the following operations for several old .dll files that are associated with the H.323 Gatekeeper service:

�	Unregister the files
�	Delete the files

The following .dll files are involved in this issue:

�	Gksvc.dll - Microsoft H.323 Gatekeeper Service
�	Gkadm.dll - Microsoft H.323 Gatekeeper Manager
�	Gkif.dll - Microsoft H.323 Gatekeeper Interface Stubs DLL

To resolve this issue, follow these steps:

1.	Click Start, click Run, type cmd, and then click OK.
2.	At the command prompt, type the following commands, press ENTER after each command, and then click OK if you are prompted: � regsvr32 /u C:\Program Files\Microsoft ISA Server\gksvc.dll � regsvr32 /u C:\Program Files\Microsoft ISA Server\gkadm.dll � regsvr32 /u C:\Program Files\Microsoft ISA Server \gkif.dll
3.	Rename the .dll files. To do this, follow these steps: a. Click Start, click Run, type cmd, and then click OK. b. Change to the C:\Program Files\Microsoft ISA Server directory. c. At the command prompt, type the following commands, and then press ENTER after each command: � Ren gksvc.dll gksvc.old � Ren gkadm.dll gkadm.old � Ren gkif.dll gkif.old
4.	Install the ISA Server 2004 service pack.