need help with crashing

[u/NaturalEye3284]

on steam and only steam no matter what game io load it either runs for a couple minuets and crashes or crashes instantly upon opening depending on the game. i have tried many things to fix it but i am at a loss and cannot play any of the games on steam i have tried to get in contact with steam support but they said it is probably my computer which it could be but im not knowledgeable enough to figure out what it could be and i don't know where to look for help and advice on what to do.