1) First check your CD/DVD Drive is working , it might be because of dust.
2) If possible try installing your OS using a USB PEN-drive
3) Second Basic thing to do would be To disassemble everything in your CPU Cabinet, clean them and Assemble them back. Most of the my hardware problems have been solved by this method.
4) Make sure you clean your RAM (the golden part) with a dry cloth. I face sudden system stop like this mainly in the monsoon season since moisture gets inside the hardware
Aqui estão algumas dicas para lembrar antes de jogar fora seu computador antigo