Inside the new MinDumps:
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BugCheck 1A, {5001, fffff78000001000, a09e, fffff980068ef201}
Probably caused by : ntkrnlmp.exe ( nt! ?? ::FNODOBFM::`string'+1587f )
Followup: MachineOwner
BugCheck A, {153557, 2, 1, fffff80001e93d9b}
Probably caused by : memory_corruption ( nt!MiUnlinkFreeOrZeroedPage+db )
Followup: MachineOwner
BugCheck 1E, {ffffffffc0000005, fffff80001eb3122, 0, ffffffffffffffff}
Probably caused by : memory_corruption ( nt!MiComputeFlushRange+292 )
Followup: MachineOwner
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Ok please check your BIOS settings are automatically setting up your CPU (ie no to overclock etc)
Unplug your floppy drive (even the DVD drive) and test again
Confirm your Ram is the right Ram for your system (voltage & speed being the concern)
This error still reports as memory related (even though your tests are ok!)
Possible remove 1 Ram card (just in case)
I suppose another option would be page file
You can turn this setting on and off by right-clicking the Computer icon, clicking the Advanced System Settings link, then clicking the Settings button under Performance. Here's a guide:
https://www.techspot.com/guides/72-windows-vista-memory-tweaking/page5.html