A can or two of compressed air does wonders. You don't need to take anything apart. You can pick it up almost anyplace that sells electronics.
Thanks, I did use compressed air to clean out the dust and it seems to working ok. Once I had the OS installed and updated, the pc started to reboot spontaneously. I think it may have been overheating a bit or there may have been a hardware issue inside as I had installed a second hard drive and a second dvd burnrer. I went back in and reconnected the two hard drives and made sure the cables were not touching the mother board. Seems to be ok now.