Mobile Client Install Error

I am doing an install of the mobile client on an XP SP2 machine.

The install keeps failing the message is the Installer was interupted.

The install log show the following:

The InstallScript engine on this machine is older than the version required to run this setup. If available, please install the latest version of ISScript.msi, or contact your support personnel for further assistance.

The InstallScript engine is missing from this machine. If available, please run ISScript.msi, or contact your support personnel for further assistance.

Any suggestions?