There's a chance the hardware in your computer is bad, in other words, the devices and circuitry inside your computer is probably fried or suffered water damage to the point it's causing serious issues for your system. How long has you since not used it? Did anything happen to it in the past that you may think is causing it a problem now? What I would do is get a hard drive enclosure for a internal hard drive for a laptop and take all your documents off it and copy it to an external hard drive and then re-image your PC (reinstall Windows) with the internal hard drive in it (after putting your documents in a safe place).
Simple Thanks and Regards, Brandon T. H. Programming in C and C++ now, now developing applications, services and drivers (and maybe some kernel modules...psst kernel-mode drivers...psst). Many of life's failures are people who did not realize how close they were to success when they gave up. - Thomas Edison