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If you are updating an old driver, the system cannot replace files that are currently "in use." A restart allows the installer to swap those files before the OS fully loads. What Happens if You Don't Restart?
A second, more technical reason concerns the operating system’s kernel—the core of the OS that has unrestricted access to hardware. Many printer drivers, especially those for multi-function devices, install kernel-mode components. Changes to the kernel cannot be applied dynamically without risking a system crash (a “blue screen of death”). By requiring a restart, the OS ensures that the new driver is loaded cleanly into the kernel at startup, and that any old driver components are completely flushed from memory. This is analogous to changing an airplane’s engine mid-flight versus on the ground; the restart provides a controlled environment where critical system updates can take effect without conflicts. install printer driver restart computer required
Printers rely on a background process called the Print Spooler . A reboot ensures this service recognizes the new driver and starts communicating with the hardware immediately. If you are updating an old driver, the