Memtest86+ is a popular memory test.
Your BIOS (Setup) may have a hard drive diagnostic. Try Windows' disk check. The best dianostics are usually the one you get from the hard drive manufacturer.
If it just shuts down abruptly as if you had pulled the plug my top suspect is the power supply, especially if this is a desktop.
Your BIOS (Setup) may have a hard drive diagnostic. Try Windows' disk check. The best dianostics are usually the one you get from the hard drive manufacturer.
If it just shuts down abruptly as if you had pulled the plug my top suspect is the power supply, especially if this is a desktop.