Windows 8.1 wont update or let me use app store

[Valhilla]

My Windows 8.1 seems to be messed up. Whenever I try to update it, it just says "Preparing to install" and never does anything. I have left it to install for 8 hours and when I got back it hadn't moves an inch and still said preparing to install. I also can't use the app store because it says I'm not connect to the internet when I am indeed connected to the internet. I have tried every solution I could find for my problem but nothing seems to work. Another thing (I don't know if this is related) is when I open File Explorer It takes soooo long to load and I'm not even searching for anything. I've also ran a lot of virus scans. I'm not very smart when It comes to Operating Systems and I want to try every option to fix it before reinstalling Windows all together so any help would be greatly appreciated. I'm also providing a screenshot of my File Explorer to show what it does for 5 minutes before letting me use it.

 

[Unolocogringo]

Defrag the hard drive.
Then under search type CMD
when the icon appears ,right click it and choose "run as administrator"
in the black screen that pops up type
sfc /scannow
There is a space between sfc and forward slash.
This will check and replace any bad or corrupted system files.

 

[Deepak Jarang]

Try restoring your system to the last restore point that had been created when installing an application software. I think it would help...