First of all what is the exact model number of your system? If you are able to run diagnostics (F12 immediately at boot) watch for any errors especially RAM or drive errors.
I have been getting Bsod lately.  Tried many ways.  Still have problems.  Finally decide to do à recovery using usb.  But during recovering, Bsod happens again.  Couldn't complete recovery process.  Now I can't boot from computer. Can't do recovery.  Can anyone help?  
Bsod occurs during recovery using usb