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Using a large Phillips screwdriver is the most helpful approach for removing a heat sink in a desktop tower system for several reasons. Typically, heat sinks are affixed to the CPU with screws, and a Phillips screwdriver is specifically designed to fit the cross-shaped recess of these screws, providing a more secure grip and effective torque when loosening them.

Additionally, a large Phillips screwdriver allows for better leverage compared to smaller tools, which can be essential for loosening screws that may be tightly secured due to heat or age. The precision of the Phillips design minimizes the risk of stripping the screws, which can lead to further complications during disassembly.

While other tools such as flathead screwdrivers, tweezers, or pliers may be useful in specific scenarios, they lack the effectiveness and appropriateness of a large Phillips screwdriver in this specific task. Flathead screwdrivers cannot engage with Phillips screws properly, while tweezers and pliers are not suited for the force needed to remove screws safely and effectively. Therefore, the large Phillips screwdriver is the optimal tool for safely and efficiently removing a heat sink from a desktop tower.