iTunes error for ISScript.msi

I'm continually getting an error message when I try to install iTunes with Quicktime (XP Home, SP2). It states I have an error with my Install Script and should install the latest version of ISScript.msi. I've uninstalled and installed every version there is, run a registry check and updated everything I know possible, but they still won't install.

[404 byte] By [vintage1622] at [2008-1-7]