Why would you want to remove the branding? It won't run any faster without it and it won't last any longer with it gone. The only possible reason I can imagine for wanting to remove it is so that you can pretend to your friends that you built it yourself....?
I've been researching the story of Noah's Ark. What many people don't realise is that there were two arks. The second contained several levels and was used to save the freshwater fish.
It was known as the multi-story carp ark.
The switch at the back is not designed to be turned on an off repeatedly, it's not a conventional on/off switch, it's an isolation switch designed to be used on those rare occasions when all power to the PC must be removed. TBH I don't know why people shutdown a PC at all, I never have since...
Personally I use Macrium Reflect free, and have done for many many years. Macrium no longer offer the free version but you can still get it at https://m.majorgeeks.com/files/details/macrium_reflect_free_edition.html.
Please make the Dropbox file public so that I don't have to request access.
One important question: @SpyderTracks asked whether you can boot the Windows installation media?
You'll need another PC/laptop or a friend's PC/laptop to make a bootable USB drive containing the Windows installation...