punbb not displaying with a skin

hi all
i've done an install on my website and server for punbb, it displays within the framework of the site but there are no forum graphics or framework as i would expect to see.  Is it because i have placed the forum code within the site framework, should i just do a clean install of the forum software?

the forum is at this address...
http://vivapilates.co.uk/forum/

any help would be greatly appreciated

thanks
ben