If your computer started misbehaving after you have installed new programs or games, it is possible that one of them is creating a conflict in your computer with one of the drivers.
Also, if you are a Windows user and see one of these stop codes: STOP 0x0000007E (SYSTEM_THREAD_EXEPTION_NOT_HANDLED), STOP 0x0000008E (KERNEL_MODE_EXCEPTION_NOT_HANDLED) or STOP 0x00000050 (PAGE_FAULT_IN_NON_PAGED_AREA), that may be another sign of a program-related conflict.
To learn how to uninstall programs, check out the don't know how to uninstall a program / application solutions.
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When your computer crashes and the following stop code appears: STOP 0x00000050 (PAGE_FAULT_IN_NON_PAGED_AREA), the system failed to access a nonexistent piece of memory, almost always due to:
Windows offers an option which allows you to boot to the last known good configuration (the one before the computer crash occurred).
To boot to the last known good configuration:
Note: If you have other operating system(s) beside Windows (eg. Linux, Mac OS), highlight Windows, press Enter and then press F8
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