Login conflict with an older drupal install

Hello all - I have recently built a new drupal 7 site at www.icanw.org.uk/cms - it has been created as a separate site in the /cms folder. It seems the original site at www.icanw.org.uk was also a drupal site. Having built the entire site, now when i try to log back in at www.icanw.org.uk/user it shows me a 404 error from the original site. Does anyone have ideas as to how I can get back to the admin section within the cms section? thanks!