There is a Windows 10 theme for KDE Plasma 5 on the kde web site here:

https://store.kde.org/content/show.php/Windows+10+Plasma+Theme?content=174453

I may have an honest-to-goodness DOS 6.2.2 floppy lying around if you're really desperate.I can guarantee you it has the exact look and feel you're looking for

I'd recommend Linux Mint XFCE for a newbie to Linux, it's based on Ubuntu and uses the same package manager, and the XFCE desktop is simplistic and easy to use. You won't find something that will be exactly like 7 in terms of design, but Mint+XFCE something that will make the transition to Linux fairly easy. ^^

Firefox, Thunderbird, LibreOffice, GIMP, etc. will make reliable alternatives for some Windows software.

It was an upgrade, so you need the basic disk set as well.

Personally,I fell into this trap at first.I even kept my Windows 7 HDD on the shelf for a couple of months,and tried a bunch of windows-like distros on a new SSD.I eventually found that plain old Ubuntu 16.04 worked best for me.On the software side,it took a while to find Linux software that worked for me,but this is a matter of trial and error.If a certain program doesn't do the job,try another.There are lots of tutorials on Youtube and elsewhere,or just keep trying different programs.One example:in windows I really liked Adobe Lightroom.I eventually found that a combination of Gthumb and Rawtherapee did the job for me.Linux programs tend to be more specific,and therefor you may need two or more programs to get the functionality you need.Just keep playing with stuff til you find what you need.By the way,that HDD with windows on it never did go back in.It's in some guys Playstation now(no more windows on it).Don't give up.

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Great advice from the others...give Q4OS a try for a Windows type look & feel!