Help phone memory problem

[super666]

Hi guys could any 1 tell me how to delete files that are on the phone memory i have factory reset the phone 3 times and then switched the fstab round so my sd card is actually internal now. This is the 2.15 gb phone memory i cant seem to delete the files hell i cant even locate them and i really dont wanna delete the wrong files as this is my 2nd droid phone 1st 1 lasted 3 days i would be trully greatful to any 1 who could help me with this problem TIA