I had reloaded Win 7 just prior to my upgrade to WIN10. Don't normally like to do an upgrade but I was pretty sure it was still clean. So on 2/14/16 id did the upgrade so I'm in the 30 day timeframe if that makes any difference. I just don't really like WIN 10. I did a Acrtonis backup of Win 7 b/4 I did the upgrade &it is on my backup HD. I have the OldWin in my C drive but it looks like the opinion on the Forum is to use a backup like Acronis rather than the old Win file I have in the C drive now. OK, so how do I reformat the C drive or do I need to reformat before I get Acronis to reload my OSP of Win 7 , now do I need to do anything else before reloading. My "C" drive is used for my OSP & programs only.