Delete everything in C:\Program Files\Sony\EverQuest2\UI eq2 will download a new default folder...
Delete eq2.ini from C:\Program Files\Sony\EverQuest2
Then follow the install instructions from the UI mod that you are trying to use if it is PERDV8
Place the PERDV8 folder in C:\Program Files\Sony\EverQuest2\UI and place the eq2.ini into C:\Program Files\Sony\EverQuest2
Then log in and try it (forget about the char settings file for now)
Then come back here and tell us how you got on and i am sure either me or sombody else will tell you how to install EQ2 map to that UI folder (and get the UI set up with the settings file also)
GL bud