I decided to have more space on my SSD. So since my Win10 upgrade has been working "ok" enough where I wasn't going to change back, I allowed windows to delete the temp files for win8.1 re-installation. Fist, I did this on 9/26/15. Just in case someone here might know if windows released a buggy update. Issues: 1) The micro sd slot stop reading the card. When the computer starts up, it gives the card a generic name like "SDHC:" instead of "64GB:" which I named it. If I take the card out and put it back in a few times, it'll read it correctly. BUT I switched from a 32GB SDHC (NTFS) to a 64GB SDXC (exFat) recently and not sure if I had that problem before I cleaned the computer. 2) Random items quit responding. Example: I click settings and nothing happens. If I reboot, it works fine. 3) Pen doesn't always work. But I think I had that even with windows 8.1. Reboot fixes that issue. 4) Not really an issue, but when closing the keyboard, windows would ask if I wanted to switch to tablet mode. It used to be too low to the bottom of the screen where the task bar would hide the YES/NO buttons. Now its moved up on the screen so I can see the whole pop-up window. 5) Randomly on startup, Wifi would be on, but say no wifi networks. Turning wifi off/on doesn't fix it. But rebooting will get wifi to work where it'll find networks.