Since there are a lot of questions about windows 10 activation and dual boot, I decided to post my experience with the installation process on my laptop. I started with two dual boot windows 7 Ultimate installations activated by DAZ Loader using the BIOS method. At first I upgraded the windows 7 installations one at a time using a DVD burn with a MSDNAA image of windows 10 (Multiple Editions). All went well, both windows 10 were activated without problems. I then decided to delete the existing partitions and completely format my laptop hard drive and try to install windows 10. Using the same DVD I created two new partitions and preceded to install windows on one of them, when it was done I checked, and for all I know windows was activated and installing updates. I proceeded to install windows 10 on the second partition and once again when it was done windows was activated. The conclusion I make from my experience is that I can install as many copies of windows I want on my laptop because it's key is activated on Microsoft servers. Besides using DAZ Loader on windows 7 I did not use any tools to activate windows 10 at any time. Hope that my experience clarifies some doubts about activating multiple windows 10 installations on the same computer.