Welcome to the forum!
When you started using Windows, was Inkscape already installed? Or did you install it?
Well, either way, the first thing I would suggest is to uninstall, then reinstall. (You might want to get 0.92.2 while you're at it....unless that's what you have and you made a typo.) Be very careful as you select which version you need, and don't use the new update feature. Please choose the full install option.
If you still have the same problems, we'll need to make a bug report.
Do you know how to uninstall on Windows? Just in case, Control Panel > Programs and Features. Give a moment or 2 for the list to finish populating. And you should be able to see what to do from there.
Just to be thorough download a fresh installer package.... Or the 7z package, if that's what you want.
Well actually, if you had the 7z version to start with, just delete it, instead of using Programs and Features.