major blog structure problems

I have a blog located originally at www/toryboynews.co.uk/blog/wordpress. i wanted to make it so that users could leave off the wordpress bit of the address so I followed the instructions in the help section and now the whole blog is refusing to load claiming that various pages such as wpsettings.php on’t exist, when they clearly do according to the files on my server.
It m,ay be that I hav typed in the wrong location for the wordpress files on the settings page, but whaever it is the blog is now not working.
Is there a way i can sort of ‘hack’ into it to put it back to what it was so that I can start the whole process over?