Fancy shit

okay there's a thing called WinDirStat that I want you to install, it's a visualizer for the hard drive, looks like the link I'm about to send you when it's done. You can hover over the individual blocks and it helps figure out where space is being wasted really well.
http://imgur.com/gDNgo8K
So after you clean up the disk a bit and save space, there's another tool called CCleaner by a company called Piriform. in the program there's two sections you want to do, "cleaner" and "registry" analyze and then fix problems on both of those, that'll clean up little things
After that, another program called Defraggler, just a disk defrag program. Let that run, it'll fix any issues in the disk
after THAT, we're almost done, open up Task Manager and go to the 'startup' tab. Turn off any crap that doesn't need to be running 24/7 in the background of the computer. Skype and Spotify and shit are usually the first to go. After that see how it's running and we might do more to it.

Windirstat: https://sourceforge.net/projects/windirstat/files/windirstat/1.1.2%20installer%20re-release%20%28more%20languages%21%29/windirstat1_1_2_setup.exe/download?use_mirror=jaist

CCleaner: https://www.piriform.com/ccleaner/download/standard

Defraggler: https://www.piriform.com/defraggler/download/standard