Hi Ben ... I took a look ...
This is based on the Trial version but I'm sure it is similar for the full game ...
(dunno about vista but would imagine it is similar)
On XP there is a config file created here ...
C:Documents and Settings***YOUR NAME***Local SettingsApplication DataCAPCOMDEVILMAYCRY4_TRIAL
It is called ...
config.ini ... open it with NotePad ...
Change these two lines ...
[DISPLAY]
Resolution=1280x720
RefreshRate=60Hz
to whatever you desire ... such as ...
[DISPLAY]
Resolution=5040x1050
RefreshRate=57Hz
or ...
[DISPLAY]
Resolution=3840x1024
RefreshRate=60Hz
Just in case anyone can't start the game at all and therefore there is no .ini created ... here are a couple in this zip ...
DEVILMAYCRY4_TRIAL_TH_ini.rar
They are called ...
3840 config.ini ... and ...
5040 config.ini
Rename the one you want removing the number at the start so it reads just ...
config.ini
Now ... make this folder ...
C:Documents and Settings***YOUR NAME***Local SettingsApplication DataCAPCOMDEVILMAYCRY4_TRIAL
and put the file there ... :D
Hope this helps ...
Please let me know ... 8)