How to get access to all xp files from windows 7?

i recently got windows 7 ultimate and installed it.i still have all my files on my old OS (xp) when i try to use any of the files i have to change the ownership and i still dont have access to any of the executable files.my internet connection is very slow so i cant even download the "windows xp mode".can someone tell me how i can get full access to all my win xp executable files!?!?!