Finding a reputable third party application to convert PDF to DOC/DOCX may be a little tricky, but to convert anything to PDF is simple. Microsoft includes a PDF Printer in Windows 10, and then there’s always the well-established CutePDF Printer.
I’m later to the game then a lot of people here. Got my first PC in ’94 and started with WIN3.1, NT 3.5 and OS/2 Warp with Prodigy and Compuserve dialup, but never had much of a problem with viruses’, malware, spam, popups or any other the of hazards of computing. I tend to stick to software from well-known publishers. If I have to rely on another application to make the first application usable, I don’t want it. I refuse to use voodoo system maintenance and registry cleaners that do more harm than good. It’s not hard to keep PC running smoothly without voodoo software. Do a clean install of Windows, update it, only install software that you need. Both at home and at work, when messing around with new software from a developer besides Microsoft, Adobe, Autodesk, PTC and a few others I always do it is a sandboxed environment first, if I can. VMWare is an awesome utility.
Like so many other pieces of software, I think Malwarebytes is just too bloated now. I used to be a huge fan of Nero Burning Rom for media creation, but they added more and more functionality and it became so bloated, people complained and they came out with Nero Express, that just included core functionality. Fifteen years ago I swore by Zone Alarm Pro as a software firewall, but then they added more and more and it turned to crap. That's why I went with a centrally managed endpoint protection solution at home. I get to choose exactly what I want and what computers I want it on