PC Shuts-Off .!! Why? Frustrated Over Here?

We'll try downloading Microsoft security essentials and scan for viruses (it's free anyways). If that doesn't work try re-installing windows. I also had a problem with my Sony-Vaio where it barely ran and kept killing the hdd. Never buying a vaio again. You could also contact Sony at 1-800-222-7669 but don't put any money into an 05 computer.