Error #121

[hazyskittles]

So I managed to fix the other problem I was having with the Interface.mpq, but this time a new error pops up every time I click the wow.exe. "ERROR #121 (0x85100079) Version Mismatch." "DBFilesClient/Achievement_Criteria.dbc has wrong number of columns(found 28, expected 31)." I tried reinstalling the game again to see if that would solve the issue, but it didn't. I'm hoping someone has a fix for this.

[Nifnifa]

have same.. please help

[Archibaals101]

I Moved the whole WoW folder to Program Files (x86) and it fixed the problem.