We went to PAQ company (Equipamentos de Escritorio) where the employees thought us how to disassembly PC, how to use safety measures procedures and the adequate tools, how to detect and remove the internal components of the PC, how to make PC upgrading operations and how to re-assembly a PC. They also showed us the installation of the operating system and the first boot-system, how to explore BIOS and modify the boot sequence order, how to use the Run Commands option, how to create a restore point and restore the system to the selected moment and how to simulate and solve frequently met maintenance problems in PC troubleshooting.