Hi,

IE7 and IE8 support is not present on XP machine having IE6. XP with IE7 is required to have IE7 and IE8 beta 1 support.

(from Homepage :

Minimum requirement : Windows Vista or Windows XP with IE7 (Windows XP with IE6 has some minor problems and IE7/IE8 instances do not work under this config
)

This will maybe change in a future release if I can make IE7 and IE8 work under this XP/IE6 config.