saving as .dds problem

gday all,

My problem is quite simple but I don't know how to fix. I have been trying to save an image as a .dds (direct draw surface) image, but the box (screenshot below) with the 'save' button on it, well the save button doesnt come up as clickable. I've tried image re-sizing etc. have checked the plug-in files and so on, the plug in is installed. I'll let you analyse the screenshot, and get back to me.

Thanks a lot.

EDIT: screenshot helps.

Do you have the plugin? If not download it here:

http://developer.nvidia.com/object/photoshop_dds_plugins.html

More info here:

http://www.google.co.in/search?hl=en&q=dds+format+photoshop&sourceid=navclient-ff&rlz=1B3GGGL_enIN328IN328&ie=UTF-8&aq=t&oq=dds+form

Hope that helps.