Originally Posted by Killerfist
Are you launching it through the GtaIV.exe or the LaunchIV.exe? You should use the last one or it won't work
If you're already doing that I'd say the only possibility that remains is that you've installed the wrong version of either scripthook or xliveless (or both).
No need to downgrade though, the latest patch should work fine
I'm using LaunchIV and xlive is the correct version!
Also, I downgraded due to mods working better on 220.127.116.11!
Had to delete settings folder in:
%localappdata%\Rockstar Games\GTA IV\settings