Modx 0.9.6 installation woes

aloha everybody
am trying to install modx (0.9.6) on my Windows laptop (XP) and after confirming installation options, am presented with the following message

Invalid install action attempted. [action=summary]

any ideas?

Cole

Whoops. Further info

Web Server:

• Xampp (v1.5.3a) utilising:
• PHP v5.1.4
• Apache v2.2.2
• Operating System Win XP SP2

Database:

• MySQL v5.0.21

MODx:

• 0.9.6

Browser/Client:

• FF 2.0.0.7
• Win XP SP2