Duplicate site ?p=5

Hey

I just created a website for a friend of mine who runs a little one-man company.
The website can be found here:
http://brandtsbilpleje.dk/

My problem is, that if i search for the site on google i get two sites. The right one and this one:
http://brandtsbilpleje.dk/?p=5
Which have all this stuff on that is not supposed to be there. How do i remove this ?p=5 site?