I have bought a new desktop machine with AMD phenom Processor and JM26GT4 motherboard.
My system used to shut down abruptly without giving any message, i used to work in Windows XP, recently i have changed the operating software to Windows Vista (Basic Home edition), it worked fine for first 2 days and now again it has developed a habit of getting shut down as if somebody is putting off the power.
In system maintenance log i found "System Service error", which stopped while installing automatic updates of windows.
i dont know how to solve the problem, whether it is a software problem or any hardware problem.