Massao: Atlas should run no matter what language Windows is in. You should check out Q3 in the BL Game FAQ to make sure you installed the East Asian Language pack and switched your regional settings over to Japanese correctly too (BL games don't use IME).
Also, read only has nothing to do with copyright protection. (Older) software usually uses Safedisc, which you need to Daemon Tools or Alcohol 120% to bypass.