BSOD with IRQL_GT_ZERO_AT_SYSTEM_SERVICE during system calls

The problem: A driver makes a system call while running at an incorrect interrupt request level, violating kernel expectations.

Symptoms: Blue screen shows IRQL_GT_ZERO_AT_SYSTEM_SERVICE; often tied to a specific poorly-written driver; may occur during specific hardware interactions like printing or scanning.

Likely cause: Buggy driver violating IRQL rules during system service calls, outdated driver incompatible with current Windows build, driver conflict.

Category: Blue Screen / BSOD · Difficulty: Advanced · Windows: Both · Error code: 0x00000004

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