Built a computer a while ago, now I ca only open it in safe mode(with networking).
1. Is there a way to put the computer automaticly in safe mode, so I don't have to restart to get in.
2. What does this suggest the problem is, computer freezes in normal mode, but works perfectly in safe mode.
I would suggest it is a driver related issue, since Safe Mode only runs limited amount of drivers (basic ones) or heat related. Did you install any new software or a new device before you started having issues?
Also, you might want to run MemTest86 to rule out possible bad RAM, as another possible cause.