Stuck on map loading screen.

Whenever I select a map; my Gmod freezes on the loading world screen. How can I fix this?

try to change your addon folder to add or anything you want , then try it. i had that porblem , when you change addon folder name to other things try it , if its work then try to remove all of adons you have except wiremod. some of addons breake game such as css non-steam content.

Will I loose my stuff?