My computer (pretty old Packard bell from 2007) have been working fine with no problems ever since i got it but now i get a blue screen every time i start it. it even crashes in safe mode and when i do a windows start repair. i don't remember installing any new things that might cause it and sometimes i can log in and do stuff for about 30s before it crashes. anyone know what can be the cause and how to fix it? would love any help.