Paying Microsoft for their bloatware is a waste of money and only the dumbest bottom feeding plebs still pay for their proprietary garbage.

Your solution is Libreoffice:

https://www.libreoffice.org/

If I were you I would recommend ripping a pre-activated Windows Vista or 7 bootable ISO to DVD and having an extra backup. You can still use open source software like Libreoffice on the older Microsoft operating systems. Consider sourceforge.net for other free open source software programs. As for a decent alternative web browser, try out Librewolf (it's more secure than any corporate web browser out there currently and you can harden it using about:config once you take a little time to learn how).

The only one keeping you from using better operating systems and software is your own willful ignorance.