Alright,
Let me tell you something about the new bug check you got.
BugCheck 1000007E STOP 0x0000007E: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED BSOD Index
Usual causes: Insufficient disk space, Device driver, Video card, BIOS, Breakpoint with no debugger attached,
Hardware incompatibility, Faulty system service, Memory, 3rd party remote control.
This bug check including your previous bug check are both related to hardware. (Hardware as in any part. It could be the motherboard, the ram, the cpu, the gpu, the usb ports..anything!) Asking for your msinfo32 file now is out of question as you were facing problems with this laptop from the time you purchased it.
Getting straight to the point, I would advise you to take the desktop back to the store you got it from and explain all the issues you had with it from start and see what they can do for you as its already out of its return policy.
I wish you good luck and am sorry that I couldn't be of more help.
Let us know your final decision if you feel like.