ZaSu

I normally do clean installs using that first year's  version of 10 burned onto a disk (it updates to the newest version) but I  have used it to upgrade 7 which would keep the already intalled software which needs to then upgrade themselves.

Why don't  you just save your files, do a clean install, buy a cheap MS 2019 Office key (Z2U.com is a great place for that) reinstall your legit software that you should have the keys for or retrieve them prior to doing anything.

If your are running 7 still your hard drive has to be ancient so you ought to upgrade to Solid state hard drive of which a small one is harely the cost of 3 or 4 overpriced Starbucks coffee, if that much.

Whatever you do back up your files even if you just attach and email them to yourself (poor man's cloud storage;-)

Good luck