this is what you gonna do if R.E does not work in your vista
1.right click on the "openfirst.exe" click properties then go to compatibility put check on compatibility mode and run as windows xp..then run as an administrator
2.right click now the R.E. 7.5.2.exe click properties then go to compatibility put check on compatibility mode and run as windows xp..then run as an administrator
3.right click now the grandchase.exe and click properties then go to compatibility put check on compatibility mode and run as windows xp..then run as an administrator
4.after you click start on your grand chase close the openfirst.exe..then thats all..
hope it does work in you..
it works for me..