Windows 10 where do i start?

[Allware]

Hey guys,

To start off guys i'm not to computer literate so please bare with my poor terminology. I brought a Dell latitude from the link below, i have had my Dell Latitude E6420 locked away for a while and decided to get it out and up and running again to use as a work laptop. It started up fine with no problems at all and i had the option to update to windows 20 (from windows 7) since i have done this there is just one problem after another. First off the laptop keeps freezing at random points, i could be doing next to nothing or i could have the laptop doing 300 activities and it will freeze either way. Then sometimes my laptop isn't detecting my wireless mouse so i have to shutdown the laptop and turn it back on again for it to work. And Finally the sound keeps messing up when ever i plug my headphones in i have to update the driver, once finished the speakers on my computer don't work i have to update them drivers and restart. These problems just keep going round and round everyday i have something i have to mess around with. What i need is some software for sale or downloadable to fix these problems i am having with i assume is windows 10.

Any help would be greatly appreciated, it's really getting boring now.
http://www.used.forsale/
windows 10 icon.jpg

Thanks guys