No you can, But you will have to use FTP, log into FTP select your nuke files from your your older root /phpbbnuke and highlight all your file inside there then move to your 1st directry, then they will transfer within a few minutes and your done.
yea i guess i could make a page on the root that redirects you to it if thats what you mean.. i dont plan on doing it now i was just wondering for when i get my site done..