Have encountered an interesting problem. Today I was working with WORD on my PC when it powered down. It then booted up fully twice but immediately powered down on opening any program, now it will switch on but only momentarily, often not even making it to the first boot up screen. Is this indicative of overheating or some other internal problem? Is it even related to the hardware? Please help I'm stumped

Can you start in Safe Mode?

Tap the F8 key after the BIOS POST yet prior to Windows starting.