Hi there and thanks for coming back to me.
I got the free version of win 10 which in my understanding there is a digital licence all ready therefor I dont have to mess with it. From the other hand the operating system I have is win7 with a service pack 1. i havent done any changes to the system itself except what the system did on its own. Meaning from the moment it was start to download the upgrade something happened and i got the problems I described in my initial post. As because there are many issues with it, I have download (directly from Dell for example all drivers, all bios, and anything it was available for my pc) but nothing seems to work. I have download dll files and drivers without any luck. But as I had enough with it, I will give it to an expert and finish with it. Either ways thanks