Port 81 display problem

I just installed WP and view the blog it is very plain. There are no style just plain links in bold and everyting is distorted. So I installed a theme and it still looks the same. I dont have access to port 81, the browser just times out. My hosting company says I should reinstall. Is port 81 required as in [www.domain.com:81/folder]? Is there some way to change it in WP? Thank you for your reply!