After re-installing the game, NOTHING changed

!
I go explore with my savegame and go to the Dark Forest, Verdistis, Rivertown Sewers, Catacombs beneath Aleroth, Farmlands and the surroundings of Aleroth (+ Aleroth), cellar of Joram's house.
All "colation ingame music" is okay, except the Farmlands (= Aleroth music) + the Dark Forest (= also the Aleroth music!!).
If I could know ALL other NOT explored area's are okay, then I can accept a "little bit" this bug, but otherwise, NO !
And I love the Dark Forest music and especially the Wastelands music, so yeah

... HOW in the name I can know on THIS moment that these area's shall "sounds" okay???
SO I wish to know WHAT I can change in the files so it is after that well done?
@Raze:
It's strange, but if I look in the folder of Divine Divinity, I see NO "run" -folder !
The maps are like this:
Divine Divinity
capture
dat
English
monologues
Scrying
Dynamic
fonts
global
localizations
english
main
startup
static
savegames
sound
static
herous
imagelists
GOG haven't answered my question so far

...
Many thanks in advance !!
PS: So my hardcore heroin is killed by a Giant Spider I go begin over again, so no problem if my savegame going corrupt or disapeared
PS 2: Question 2: CAN I install again the disc version (V1.0034A) and update this version to V.1.05A, (the last version?) ???