Hi, I have W7 on my netbook. When W10 will be release in 29.7.2015 I will download via Windows Update W10 and upgrade it (I read that you must first upgrade and then clean install). But I want clean installation of OS. So after I upgrade to W10, how I clean install on netbook? I know I have on netbook hidden HDD part, with W7 installation, but if I want clean install to W10 how I do it, and should I format this hidden part with W7 installation? Can anybody tell me walkthrough?