I have a few friends that have computer desks in which there is a compartment for the computer. But it is a closed door compartment. The problem is there is absolutely no airflow in there, so when I open the compartment, it is rather warm in their. They have complained that certain times, their machines will lockup, and they are forced to reboot. What can I do to improve the overall cooling of the computer. One machine is a Athlon 1GHz, and the other is a Duron 600. Neither are overclocked, but what the BIOS, system temp is usually higher than CPU temp, but never over 45C. What can I do?