Many thanks for the info.No problem. As for this right here, I'm not too sure. I know that my OEM is not embedded into my PC but I have another newer PC that came with Windows 8 with an OEM key which does have it's key embedded onto it however I was able to activate Windows 8 on another computer with that key. I think OEM keys can be put on any computer as long as the brand matches. Both computer I did this on were HP. Seems to be purely motherboard related. Although I think when a key is embedded, it probably activates by itself using that key without user intervention but I'm not sure.
For me, Windows 10 RTM is working perfectly (using it right now) so I doubt I'll be restoring Windows 7. Only problem I have is AV support. Good thing is, the 29th is very close and won't have to wait long at all to get the support that I need. Right now, I'm waiting for ESET to support Windows 10. Even the beta doesn't work without problems.
I agree with you about Windows 8. I highly doubt anyone who has that will not want Windows 10 more. It's faster and more stable for me than Windows 8 ever was. I have no experience upgrading to 10 from 8. I have too many problems with 8 to have used it for long. That PC that came with 8 preinstalled I downgraded to Windows 7 Home using an old OEM key from another HP.