Preventing a computer system involves :  Carefully disassemble the computer. Each part is cleaned of dust. Particular attention is paid to the processor and video card fans and radiators. Clean the old thermo paste and put a new one with a high thermal conductivity factor. Carefully assemble the system. As a final, we review FREE operating system and if we find something wrong, we notify the client. If you have any difficulty or have any questions, please , contact us to help.