i7 4790K CPU Voltage

Hello, I have PC with CPU i7 4790K with Asus Z87-Expert motherboard. I didn't use it alsmost at all since 7 years (this PC belongs to my father who died). And now i wanted to use it and everything is working ok but I got receiving vCore to low - every few seconds. I got Warning every time...

Pics: View: https://i.imgur.com/VPn0YfU.png By the way im using BeQuet Dark Rock Pro 4.

Hello, I have some trouble with my Windows i guess... In this video you can see that in my Right Bottom screen, above my Time, date & others. I cant click. I can go to it with my mouse. My clicking on it wont work. So i guess it's something like a death part? Like death pixels. but then for...