You're welcome
1. How long after boot-up do the crashes usually happen?
2. Specs of your PC please, and/or make/model if bought.
3. If it's been a while since you cleaned the PC, open it and look for any dust of grime build-up.
4. This is a recent thing. Did you make any significant change to hardware or software shortly before the problem began?
5. Do all the main components show up in Device Manager?
6. Update your main drivers—mobo, CPU, GPU, sound, network. Any fancy drivers turned on, eg for input devices?—if so, turn 'em off for a while to test.
7. Do the crashes happen only after you launch some particular apps?