**CAUTION THIS PERSON IS NOT THE BEST AT SPELLING AND GRAMMAR**
Do you have them pesky live tiles running in your start menu
area? Also some windows 10's come with some useless apps,
ya know kind of like bloatware on phones. Only difference thankfully is,
in windows 10 if the user does not want them he/she can; disable live tiles or..
uninstall the app, from the system. When I first upgraded to windows 10 it was
slow and I went through and got rid of non essential stuff.
Also just note that sometimes or in my case.. OFTEN seems that the store freezes and the apps malfunction this has taken place for a while and then the recent update... boom fixed so it's a good idea to check that stuff is to updated to the correct version.
Click the windows symbol from your lower left.
Okay now to the right of the list of apps you'll see these
square things they call "Tiles", now right click each specific tile,
then look into *more* select "Turn Live Tile Off"
That's one way to clean up stuff.
Remove useless programs; that your not using.
I agree with Cottonball's
Try The Reset just as is mentioned in that post.
These are asked; so people can assist you
1- Did your PC come with windows 10 or was it, upgraded.
(Mine was originally windows 8.2; when windows 10 came out I upgraded)
This is actually an very important question, Microsoft for got to mention to people
that some computers are okay with the switch and some are not able to handle it it's
either too hard on their memory/CPU or for an unknown reason chooses to not play nice with windows 10. If it was an upgrade please check that your system matches up with the system requirements for running windows 10: see link: Windows 10 Specifications System Requirements | Microsoft
2- Double check this --> "7. memory left, unused is, 718 MB, 1226 MB used"
Okay so it could just be me being tired here but.. is that actually what you have left.
If your sure it is then I may have found on key reason for it being very slow.
3- What is your processor info?
Problem could be just not enough to help take on Windows 10.
Hope I helped ya, if not post again with answer to these questions and I wont stop until I find the answer.