http://www.expertreviews.co.uk/opera...ual-boot-or-vm
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You can do a clean install of windows 8.1 even if your computer came with windows 8, I don't see why you wouldn't be able to do that with the windows 10 upgrade.
Win10 Tech review is install on a old Optiplex 755 with 2 GB of ram, runs fine, just had to learn there are very few shortcuts so you need to type in what you want and watch the suggestions list to select what you want. I am a clicker, not a keyboard nut.
Win 10 still has a long way to go to replace Win 7. Microsoft seems to have the idea that a return to the command line is in the future. I had to update a Win 8.1 laptop the other day after the wireless networking WPA2 key was changed, and the window that was supposed to be available to make the change would not appear. Even a link on a pop-up menu that was supposed to make the window appear was greyed out. I had to resort to a command line entry to erase the key from the registry before Windows would ask for it.
Or you could have right click on that network entry and select to forget that network.
I tried the "forget this network" trick, but it didn't work. When attempting to reconnect, it remembered the old, incorrect, passkey.