[QUOTE=davidhk;562468]Assuming your Win 10 is activated.
Do a Repair Install, also known as In-place upgrade Install.
This method allows you to keep your files, settings and apps.
Activation is...

I'm not using SSD. I already have win10 ISO file ready to burn i just want to try to fix this before for future if same problem happens to anyone else.

Hello!

I have a problem with Windows 10 on my laptop. I had Windows 8.1 then i upgraded to Win10. Sometimes after upgrade (3-4 times a month) computer lost sound, started to work really really...