I would think this is common sense but I've seen very few posts including this info--
Please post your system specifications in your Opening Post when asking for help with PC specific Problems......
Include information like your OS, Processor, RAM, Graphics Card, etc..
It might be a good idea to indicate your game source also-- Steam, Physical Copy, Rockstar Warehouse, etc...
Please check and make sure your drivers are all up to date.
Please include as much information as possible as to the problem include screenshots or videos if you are able to... and/or if you get some type of an error code.
Be sure to try some basic things to try and troubleshoot your problem... Disable AntiVirus and/or specify game mode, Close unnecessary processes running in back ground, Disconnect from the internet (I'm Assuming you can play single player OFFLINE) etc...
It might be beneficial to check out this page https://support.rock...to-V-PC-Support
I am a console player (I don't own a gaming PC) so can be only of minimal help to you PC players.
If anyone else has some pointers or specific things you think that should be posted in a help thread-- please add them below.