Mark upgraded from Windows 7 to Windows 10. Now he needs some cheap but easy to use video editing software to edit his family home movies and digitize them. Leo says that since Windows dropped Windows Movie Maker, there isn't one available native to the OS anymore. But there are better alternatives out there. Leo recommends Adobe Premiere Elements. It's capable and under $100 - a great version with about 80% the tools of the professional Creative Cloud version.
There is, however, something built into the Windows 10 photos app that would allow you to cut out simple scenes you want to omit. Open your video file by R/C and select with open photos. Then you'll see an edit button that will let you trim scenes.
How about a good slide scanner? Leo recommends the Epson Perfection line. There's also the Kodak Scanza. But Leo also recommends using a service like Scan Cafe. They not only will scan those slides, but they'll clean them up and return them on DVD.