re-boots and blue screens could be....
1) device drivers corrupt
2) hardware faulty (motherboard, RAM or device plugged in (USB) - due to over heating and dust clogging vents etc..
3) virus/malware
try starting up in 'safe mode' by pressing at start up and choose safe mode see if its stable.
if so then its probably a device driver or device failing - if so then runs msconfig and disable all the devices and slowly go through one by one to see which one is faulty (of thesoftware)
if it staill blue screens in safe mode then its probably a hardware problem. = replace PC
