Go and read this thread HERE and see if it helps you to identify the culprit.
If it doesn`t, please attach 5 or 6 of your latest minidumps.
Your bugcheck code is most often associated with faulty ram.
0x0000007F: UNEXPECTED_KERNEL_MODE_TRAP
One of three types of problems occurred in kernel-mode: (1) Hardware failures. (2) Software problems. (3) A bound trap (i.e., a condition that the kernel is not allowed to have or intercept). Hardware failures are the most common cause (many dozen KB articles exist for this error referencing specific hardware failures) and, of these, memory hardware failures are the most common.