i have windows 7 and i changed the name of folders to this:
Basically do this...
1. rename the "editor" folder to "map_editor"
2. copy the models folder from MTA San Andreas\mods\map_editor\ to MTA San Andreas\mods\race\
3. create \mods\map_editor\maps
then i dunno how to do now...and...i cant find editor_dump because i dont have mta now i just have mta race...to make maps...