I have a Dell 7577. Five of the keys on my keyboard don't work. They magically appear to work after sometime. Also the Updates is all messed up. A Windows 10 Update comes and gets downloaded but when it comes to installation, it goes to like 45% and then goes to 0% and over and over again. I tried doing some things like updating drivers. But they didn't work.I tried booting into 'Safe mode' and check the keys, it didn't work too.