GMod Crashes everytime I join a Server

So I just downloaded GMod a couple days ago. Every time I try to join a server, GMod crashes and either freezes or freezes my whole computer up. I believe the reason for this is because when my computer starts to install the addons when joining the server, it starts to crash. I do not understand the reason for this. I believe I have all of the required specs needed to run GMod. It is very annoying. Thank you for the help!