Oh sorry completely forgot to put the gc log
I've tried again today (reinstalled the game from scratch) but still nothing.
Here's the log
--------------------------------------------------------------------------------
FF7 GameConverter, Version 0.10b
Creator: Kompass63
Editor: EQ2Alyza
Start running at    Date: 24-02-2014    Time: 15:21:25,42 
P gina de c¢digos activa: 850
ActualPath C:\Users\ANDR~1\AppData\Local\Temp\RarSFX0
You are running "Windows 7 Home Premium" on a 64 Bit Operating System (AMD64)
Real Management 32Bit WOW64
This patch is not yet applied.
Steam is installed in "D:\SteamLibrary\steamapps\common\FINAL FANTASY VII"
Installation path found at...
"D:\SteamLibrary\steamapps\common\FINAL FANTASY VII"
If an installation path IN NOT found, TYPE IT IN and press ENTER.
EXAMPLE: "C:\Games\Steam\steamapps\common\FINAL FANTASY VII"
If an installation path IS found, press ENTER.
Copying Registry Keys...
Removed CompatFlags from "ff7.exe"
Removed CompatFlags from "ff7config.exe"
Set own Registry Keys...
HKLM\SOFTWARE\Square Soft, Inc.\Final Fantasy VII\GameConverterkeys
Setting language to en...
Detecting drive letter for FF7 Discs...
Drive letter for FF7 Discs     F:\ 
Movies path found at...
"D:\SteamLibrary\steamapps\common\FINAL FANTASY VII\data\movies\"
Backing up files to be modified...
Backing up more files to be modified...
Copying English Files...
Copying 1.02 patch for ff7.exe...
Copying Aali's Custom Driver, version 0.7.11b...
Creating Final Fantasy VII Icon...
Creating FF7Config Icon...
Adding more Registry Keys...
Adding Registry Keys to HKLM\SOFTWARE\Square Soft, Inc.\Final Fantasy VII
Adding Registry Keys to HKLM\SOFTWARE\Square Soft, Inc.\Final Fantasy VII\1.00\Graphics
Adding Registry Keys to HKLM\SOFTWARE\Square Soft, Inc.\Final Fantasy VII\1.00\MIDI
Adding Registry Keys to HKLM\SOFTWARE\Square Soft, Inc.\Final Fantasy VII\1.00\Sound
Adding Registry Key to HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\FF7app.exe
Please check over the settings for FF7Config...
1) Graphics tab should have "Custom driver" set for the Renderer.
2) Sound tab should have a Sound device set.
3) Perform the Sound and MIDI tests.
Could not find the Sound Registry Key...
Please run FF7Config after this finishes.
Adding UAC Registry Keys to HKCU\SOFTWARE\Classes\VirtualStore\MACHINE\SOFTWARE\Wow6432Node\Square Soft, Inc.
Inserting Multi.dll, Hext.dll, and Languagefile...
Patching FF7anyCDv2...
Should a Laptop Key patch to be installed?
(Only necessary if no NUMPAD is present.)
NO 
Installation complete.
called with ""C:\Users\ANDR~1\AppData\Local\Temp\RarSFX0\FF7_GameConverter_0.10b.bat""
Arguments: "C:\Users\ANDR~1\AppData\Local\Temp\RarSFX0\FF7_GameConverter_0.10b.bat"
PROCESSOR_ARCHITECTURE:          x86 
PROCESSOR_ARCHITEW6432:          AMD64 
Actual Path:                     C:\Users\ANDR~1\AppData\Local\Temp\RarSFX0 
Product Name:                    Windows 7 Home Premium 
Architecture:                    AMD64 
Running in Modus                 32Bit WOW64 
OS Bit Version                   64 
Reg-Keyname Steam                HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Steam App 39140 
Reg-Keyname Re-Release           HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{141B8BA9-BFFD-4635-AF64-078E31010EC3}_is1 
Reg-Keyname 1                    HKLM\SOFTWARE\Square Soft, Inc. 
Reg-Keyname 2                    HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\FF7app.exe 
Reg-Keyname 3                    HKCU\SOFTWARE\Classes\VirtualStore\MACHINE\SOFTWARE\Wow6432Node\Square Soft, Inc. 
Steam Release is present:        Yes 
Steam Release Path:              D:\SteamLibrary\steamapps\common\FINAL FANTASY VII 
Re-Release is present:            
Re-Release Path:                  
Original Release is present:      
Original Release Path:            
Destination Path:                D:\SteamLibrary\steamapps\common\FINAL FANTASY VII 
Source Path:                     D:\SteamLibrary\steamapps\common\FINAL FANTASY VII 
Videos Path:                     D:\SteamLibrary\steamapps\common\FINAL FANTASY VII\data\movies 
Original Videos Path:             
Original Language                en 
Converted Language               en 
Original Drive Letter:            
Converted Drive Letter:          F:\ 
and now clear up Variables...
Ending at           Date: 24-02-2014    Time: 15:22:34,02
EDIT
So after all that I tried running FF7 confing to see what happened and it crashed immediately
I went to my pc and discovered that the Nvd3d9wrap.dll was the cause of the crash. Problem is, that dll is related to my graphics cards (it is a nvidia geforce card) and the only way to replace it was by running the pc in safe mode. But, even after I replaced the dll with another working one, and after reeboting the pc, the system replaces the file I put in with the original file, thus, rendering the ff7 config impossible to run. I have no idea if this is related to the problem or not, but I thought I should post it anyway.