I am unable to open my game at all after installing the Houston Police Car Pack and it's not a problem with the mods since I deleted all of them multiple times for testing to see if my game would crash again and it still did but when I delete my car mods that are DLC based cars the game opens and I already have disabled my virus & threat protection and also I have followed other support posts multiple times and still nothing works plus I already have installed the newest gameconfig & heap adjuster & even pack limit adjuster & the newest advanced hook v with even trying the old advanced hook v and still nothing...

Your topic has been moved to GTA V Support, this is not LSPDFR related.
Please post in the correct location in the future.

Rename _mods back to mods and do the following:

1. Install the Gameconfig, Heap Adjuster, and Packfile Adjuster.
2. If that does not work, that pack may simply be bad and you will have to remove it.

I just edited the mods folder to mods to _mods and it just made my screen black and i had to restart my computer twice because i could not get of it... also as i said i already added the files you talking about and i still have them installed in the right paths and i'm not what to do now...

I would try with another addon pack. It might just be that pack specifically that is causing the problem.

I just deleted the old files and I made sure multiple times that I deleted everything and I did but I now installed a completely different car pack from LSPDFR and now it's crashing again and by the way I checked 2-3 times that the game worked after deleting all the last DLC car pack and the game worked perfectly fine...

I'm not sure what else to tell you beyond re-installing the configs I linked above. That should fix any limitations on the amount of dlc vehicles you have installed.