System hangs/freeze at startup while NVIDIA services/apps start

I've done 8 hours of memtest, here's the result with no errors

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For memtest86+ to be used it must have 8 or more runs otherwise it needs to be repeated.
Memory problems. - Microsoft Community

Four two run tests does not equal one eight run test. It's important to not have false negatives.

We need to have a methodical and systematic way to rule in or rule out problems. On this test I need your help in the rule in and rule out so we can have few surprises and more accuracy.

Four two run tests does not equal one eight run test. It's important to not have false negatives.

What do you mean, I simply started memtest at boot via an USB stick and when it launched it automatically started the test, do I need to select something to run a specific test? I have two stick of RAM, should I test them one at once?

If all of the RAM/DIMM are done at the same time for 8 or more runs a pass will rule out problems and a failure will require differentiation of RAM from DIMM as well as each RAM.

zbook said:

If all of the RAM/DIMM are done at the same time for 8 or more runs a pass will rule out problems and a failure will require differentiation of RAM from DIMM as well as each RAM.

By "runs" do you mean "passes" or "tests"? Because doing 6 passes took 8 hours for 16GB, it's a lot.

This test unfortunately takes a lot of time. Many of the debugging results will indicate memory as a source of the problem as memory is almost always related to a bsod. So hardware needs to be ruled in or ruled out so that any future comments on memory can be better understood.

Yesterday I set the PEG slot as Gen3 in the BIOS and then, after the memtest, I re-applied the default XMP 3200Mhz ASUS profile, the system worked perfectly but today I'm getting the stutters at startup again...
Tonight I will test the first RAM stick, in the Event Viewer I see that IOCAgent is causing errors at every boot and I'm 100% sure it's ME / MEI related.

I set the default system language as shown in that link, but the Event Viewer isn't translating in the new language.

EDIT: I disabled the XMP profile but the stutter occurs again.

EDIT2: I don't know if this would be helpful but I noticed that in the Service_Error of Corsair LINK there's an error that didn't occured yesterday when the system worked perfectly without stutter at startup:

2017-07-04 10:01:47.8583 | 7 | ANTONIO-PC | 4.7.0.77 | DevicesMonitor | -> System.NullReferenceException: Riferimento a un oggetto non impostato su un'istanza di oggetto.
in CorsairLink4.Module.CpuId.CpuIdComponent.EnumerateDevices()
in CorsairLink4.Module.CpuId.CpuIdComponent.CollectDeviceData()
in CorsairLink4.Module.CpuId.CpuIdComponent.VisitSystemInfo(ISensorVisitor visitor)
in CorsairLink4.Module.CpuId.CpuIdComponent.Accept(ISensorVisitor visitor)
in CorsairLink4.Service.Common.Core.DevicesMonitor.<>c__DisplayClass42.<MainLoop>b__3e()
in System.Threading.Tasks.Task`1.InnerInvoke()
in System.Threading.Tasks.Task.Execute()
--- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione ---
in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
in CorsairLink4.Service.Common.Core.DevicesMonitor.<RunTask>d__29.MoveNext()

What was the Memtest86+ result for 8 or more passes with 16 GB RAM ?

zbook said:

What was the Memtest86+ result for 8 or more passes with 16 GB RAM ?

The latest memtest I did was in the image above, 4 passes with no errors

How come your not testing both ram at the same time?
It eliminates a portion of testing that is important.

What would happen if you uninstall Corsair 4 and reset the bios?
Can you do that during the troubleshooting?