Crash need help

Every time I load up gmod it always crashes at the title screen then I nedd to shut down the computer to get out help please

First of all, what are specs of your computer? BTW, why you really need to use 2 topics wih same title and same first post for single problem?

I don’t know for both

The computer specifications are using following template:
CPU: what kind of CPU you have installed
GPU: what graphics card(if desktop) or onboard GPU(if laptop) you have on your machine
RAM: amount in gigabytes
OS: what OS are you running

This example is for my computer specs:
CPU: Intel Core I5-4690K @ 3.5GHz
GPU: Nvidia GeForce GTX 970
RAM: 16 GB
OS: Windows 8.1