For #1 you had 0xA errors and an 0x27 error citing the Vista driver mrxsmb10.sys I defined both of theses errors previously and these dumps only cited Vista drivers.
However, your fifth dump gave a defifinitive answer. It is error 0x0000004E: PFN_LIST_CORRUPT
This indicates that the memory management Page File Number list is corrupted. Can be caused by corrupt physical RAM, or by drivers passing bad memory descriptor lists.
This is one of the strongest ereror codes that point to corrupted memory. Sure enough it listed corrupted memory.
For #2 3 of the dumps specifically cited memory corruption. One other simply cited Pool_Corruption and it was an 0x8E errors which are almost always caused by hardware and are especially strong indicators of corrupted memory.
I suggest you run Memtest on both PCs. If you have never done this before follow this links instructions:
https://www.techspot.com/vb/topic62524.html
There is a newer version than is listed but either one should work. If you need to see what the Memtest screen looks like go to reply #21. The third screen is the Memtest screen.
Let it run for a LONG time. The rule is a
minimum of 7 Passes; the more Passes after 7 so much the better. There are 8 individual tests
per Pass. Many people will start this test before going to bed and check it the next day.
If you have errors you have corrupted memory and it needs to be replaced.
Also, with errors you need to run this test per stick of RAM. Take out one and run the test. Then take that one out and put the other in and run the test. If you start getting errors before 7 Passes you know that stick is corrupted and you don’t need to run the test any further on that stick.
* Get back to us with the results.