I can’t get in my other account! It says, ‘Access Denied’

I reinstalled my Xp Pro. and I accidenttly formated all the accounts, but C: Drive is still not formated so can anyone tell me how to get the files from my old account. Because whenever I try to get in it says ‘Access Denied’. So if any one know how to get the files back please tell me! It would be grateful.