Windows 7 Professional 64 bit

Hey all, I wanted to update my win 7 pro to windows 10. But so far my attempts to update have all failed. I've never upgraded an OS before so I'm so I don't know what's going wrong, whether it's me or it's an issue with the computer. I first tried to update using the MediaCreationTool from...

I have a i5-2500k sandy bridge CPU 8GB-DDR3 RAM a GT 9500 GPU(really outdated) Mobo is a ASUS P8Z77-M and a 500W PSU And I was wandering if my PSU can handle a gtx 1080 or would I have to upgrade it too.