Setup has encountered the error

Hi,
While doing an installation of SQL server 2008, I get a dialog box and not letting me install the same. Checking on web, I changed the system regional setting to US English and still the same.
I need to have this version of SQL installed on my Windows XP machine. Please help me with this error message.
Setup Failure
Setup has encountered the following error:
‘LandingPage’ is not a valid value for setting ‘ACTION’. Refer to Help for more information.
Error code 0x84B40000
OK
