Note that most installation issues can be solved by turning off User Account Control (Vista) and running the file "FF7OpenGL.reg" in the "Final Fantasy VII" folder.
*Also note that the patch puts shortcuts in your start menu--the game must be run via these shortcuts for the mods to work properly.
If your game crashes upon startup or does not work properly, post a comment explaining the problem and providing the following information:
Your Operating System (and whether or not UAC is turned off, if applicable)
The console debug info provided by the FF7Music Console (you can see the FF7Music console by alt+tabbing while running the game) and/or the contents of "app.log" (use the "code" tags)
The directory your game is installed into.
...and I'll be able to help you out.