Windows XP and IE 6.0

I have a customer that is running windows XP Pro, and they need to have IE 5.5sp2 for one of their programs to work correctly. I can uninstall IE 6.0, but when I try and install IE 5.5sp2 i get the message, that a newer verison of IE is found, and cannot installed IE 5.5sp2. Does anyone know a fix for this?

Thanks

As far as I know there isn't one. IE 5.5SP2 will not run on XP.

What program relies on 5.5 sp2 ?? Maybe there is another way round this?