Nostalrius Begins - Quality wow vanilla realm (1.12)

All my addons keep on resetting to default everytime i logout. Anyone know what causes this and how to fix it? It's really annoying and preventing me from playing the game

The problem is that the WoW application does not have write access to the WTF folder.
Therefore, check file permissions for the WTF folder. You can probably also fix the problem by running the program as Administrator.