Windows 7: BSOD when accessing Homegroup shares

I have 2 machines on Homegroup. The problem machine is Windows 7 and the other is on new installation W8 (but I had this problem when it was on Windows 7 so the problem is definitely on the Windows 7 machine).
Whenever I try to access a shared folder on the Windows 7 machine from the W8 machine, the Windows 7 machine crashes with BSOD. Apart from this action, both machines are running perfectly. Trying to access the folder directly through File Explorer from W8, the Windows 7 machine crashed when I select the shared folder and it gave SYSTEM SERVICE EXCEPTION. I also tried selecting the shared folder from within File History on the W8 machine and it gives PAGE FAULT IN NONPAGED AREA.

I've scanned the net to no avail. Can anyone suggest anything please? I have attached the zip.



EDIT:Can no one help? I have since found I can replicate the BSOD just from within Windows Explorer. I open the Network folder and click on any sub-folder and it crashes. This only happens when accessing from the Network folder. Accessing from the drive folders is fine.
I have performed Memtest86 and tried swapping RAM in and out and it is fine. Chkdsk is alo fine.
One other pointer - I attempted W8 upgrade and it bombed with "page fault at non paged area". I assume this points towards hardware, not corrupt Windows 7.
This is looking like either faulty CPU cache or mobo problem, or maybe corrupt Windows 7. Any ideas anyone?