I have a NIMO N15A running Windows 11 that has become extremely unstable. On startup it repeatedly crashes with errors such as HYPERVISOR_ERROR, KERNEL_SECURITY_CHECK_FAILURE, IRQL_NOT_LESS_OR_EQUAL, KMODE_EXCEPTION_NOT_HANDLED, and RESOURCE_NOT_OWNED. It restarts after each crash and may eventually reach Windows. Once there, the Settings app closes immediately when opened. A Windows reinstall and factory reset both start successfully, but they fail when the laptop restarts to continue the process, leaving the system unchanged. What could be causing this, and how can I diagnose and permanently fix it? I need the laptop working reliably for school soon.
4 Answers
Before opening the laptop, save your files and avoid changing BIOS or disk settings unless you know exactly what you're doing. Load BIOS defaults, undo any overclocking, and check that the RAM and drive are properly seated. If this is a school-owned laptop, the school's IT department should handle the hardware diagnosis or warranty service rather than risking further data loss.
If Windows can stay running, or you can boot Safe Mode, look in C:WindowsMinidump for crash dump files. Those logs can identify whether a particular driver or component is responsible. The hypervisor error can sometimes point to a deeper CPU or motherboard problem, so several different stop codes shouldn't be dismissed as ordinary file corruption.
The variety of stop codes and the repeated restarts strongly suggest unstable hardware, especially failing memory. Run MemTest86 or MemTest86+ before reinstalling anything. If it reports errors, replace the faulty RAM and test again. Once memory passes, check the SSD or hard drive for hardware errors, since damaged storage can also corrupt Windows.
Back up anything important first. Create a Windows installation USB with Microsoft's Media Creation Tool, boot from it, remove the existing drive partitions, and perform a completely clean installation rather than using Reset or Repair. If the crashes continue after a genuinely clean install, the problem is probably hardware rather than Windows.

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