Hello! I just had the same errors on my installation this morning and following these steps i was able to resolve it.
Make sure you aren't using a crack - We don't support cracks
Update GTA IV to 1.0.7.0 (the latest version of the game, or 1.1.2.0 for EFLC) - This sometimes fixes a wide variety of issues
Make sure that you run the game as an administrator.
Make sure that your GTA IV root folder (and every subdirectory) is not set to "read-only"
Ensure that FirstResponse.net.dll is in the SCRIPTS folder and that AdvancedHook.dll is in the GTA IV ROOT folder.
Ensure that ScriptHook.dll, ScriptHookDotNet.asi and Dsound.dll OR Xlive.dll are in the GTA IV ROOT folder
Ensure that there is a folder titled 'LCPDFR' in the SCRIPTS folder.
Check that all the above files exist, if they do not, reinstall LCPDFR with the automatic installation.
Ensure that you are using up to date versions of every LCPDFR dependency and LCPDFR itself.
Install these: http://www.microsoft...9f-b21f31ab88b7, http://www.microsoft...&displaylang=en
Run a diagnostic report (found here: ) which will point any errors it can find and will be used later on if you need to post a topic.