Bug Check 0x7F: UNEXPECTED_KERNEL_MODE_TRAP
The UNEXPECTED_KERNEL_MODE_TRAP bug check has a value of 0x0000007F. This bug check indicates that the Intel CPU generated a trap and the kernel failed to catch this trap.
Generally, this BSOD gets generated due to hardware, though a VERY buggy driver could cause this to occur. Doesn't small of RAM, but I'd run memtest86+ just to be on the safe side. After that, I'd run the system file checker, to check for bad system drivers.
Assuming that passes, short term, I'd watch for re-occurrence.