If it's still crashing after you've renamed your mods folder, then it's one of four things:
1. You've edited a core game file instead of using your mods folder, and it's went wrong.
2. You're missing files from your game - accidentally deleted them perhaps?
3. Your mods folder needs an updated update.rpf. You're usually prompted by OpenIV as you launch OpenIV when this is the case.
4. An ASI, such as a trainer, is causing your game to crash. It could be outdated, installed wrong, missing extra files or even just buggy.
I'd suggest opening OpenIV to see if it prompts you to update. Then verify your game files using Steam (R* launcher for retail). Remove any ASI files from your game and launch without RPH. If that stage works, then you know it's an ASI at fault.
Make sure to test your game after each stage.
Thanks,
Zen