In this video i'll show you
How to fix GTA 4 - SecuLauncher - failed to start application [2000]
How to Fix / Bypass GTA 4 SecuLauncher Error while starting GTA 4 via RGSC
In this video i'll show you

How to fix GTA 4 RGSC Error Application Failed To Launch
How to Fix / Bypass GTA 4 Parent Control
https://youtu.be/BHJ0RFLiGG8

Microsoft Visual C++ 2005 Redistributable Package (x86)
http://www.microsoft.com/en-in/download/details.aspx?id=3387

Microsoft Visual C++ 2005 Redistributable Package (x64)
http://www.microsoft.com/en-in/download/details.aspx?id=21254


Microsoft .NET Framework 3.5 Service pack 1 (Full Package) [Offline Installer]
https://www.microsoft.com/en-au/download/details.aspx?id=25150
http://www.askvg.com/download-microsoft-net-framework-3-5-offline-installer-for-windows-8/

Microsoft .NET Framework 3.5 [Web Installer]
https://www.microsoft.com/en-in/download/details.aspx?id=21

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*IF THIS THING DID NOT WORKED, THEN TRY THIS AT YOUR OWN RISK (It worked for few but not for everyone)

http://www.mediafire.com/download/cqpdcd5c3cgpgdj/GTA4-[Fix].7z

NOTE - This is RGSC Patch, It will (or MAY) make your GTA IV to run without RGSC Client

TRY AT YOUR OWN RISK!!! , Take a backup is possible before carrying on with this Experiment.
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Download and Replace all the contents from this patch with your GTA IV Files (Take a full backup of your GTA IV if possible before carrying out with this experiment)
- Audio Details -

Audio - Mountain Dub
Artists - Gunnar Olsen
Album - YouTube Audio Library