BSOD - multiple caused by ntoskrnl.exe

On win 7 x64, on differents machines HP8100 SFF, DC7800SFF, I get randomly BSOD, all caused
by the file ntoskrnl.exe.
As attach the diagnostic results file on a HP8100.
I think it is a driver issue (old version? incompatible?)
Thanks for your analyse.

Code:

BugCheck 3B, {c0000005, fffff80002ad9e57, fffff880076dea10, 0}

Probably caused by : memory_corruption ( nt!MiPfnShareCountIsZero+77 )

Code:

Usual causes:  System service, Device driver, graphics driver, memory

Code:

1: kd> !error 00000000c0000005
Error code: (NTSTATUS) 0xc0000005 (3221225477) - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.

memory_corruption doesn't necessary mean that a RAM module is faulty, it can also point to a object which corrupted the RAM at the time of the crash, for instance a corrupted driver or program. Paging files and the CPU caches can also be causes.

Follow these steps -

Test for any corrupted drivers, by running Driver Verifier for least 24 hours, stop the test if a BSOD occurs before this time frame. Driver Verifier will place stress on the drivers within your system, which will cause corrupted drivers to crash and hopefully be pinpointed.

• Driver Verifier - Enable and Disable

More Help and Information with Driver Verifier - Using Driver Verifier to identify issues with Drivers

Memory:

• RAM - Test with Memtest86+

Run Memtest86+ for least 7-8 passes, and preferably overnight as it can take a while to fully complete.

Test each RAM stick individually, if an error is found then move the same RAM stick into the next DIMM slot and test again, if errors are found for the same RAM stick in every available slot then you have a faulty RAM module. On the other hand, if no errors are found in the next slot or the other slots for the same RAM module, then you have a faulty DIMM slot.

Test each RAM stick and every motherboard DIMM slot available.