Yes, switch to a Linux distro. Works perfectly even on older machines ( and it's free )

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I'm running an XP machine right now from 2004 and it works fine even before I upgraded the socket 939 Athlon 3500+ single core to a 4800+ dual core 939! It was slow at first because I had to manually set the CPU frequency to the proper setting manually in BIOS. I also have a P3/450 from 1999 Running XP and this Office runs just fine (with 500 megs of RAM)
Perhaps you have some very nasty Malware or Virus or an incorrect driver. Select your Task Manager (right click on Task Bar or press Control Alt Delete to enable ) and it will tell you what is running and will also tell you what the CPU load is with the applications or programs running.
Now as for Linux I used to use it back in 2006 and if there is a problem such as simply installing simple software you have to refer to the CLI AKA command line interface or terminal to do this If you don't know or cant find the command to type in you sit in front of your monitor with on your face. After dealing with Win 10 on my older hardware (socket 939 dual core blacklisted CPU) and limping on a glitchy computer of which every time I received updates the PC would start crashing without any notice and restart and stumbling. I ripped it out by the roots and reinstalled Win 7 because XP isn't supported and you cant get updates on your browser etc. anymore. Okay back to Linux. The latest and greatest installs without my Mouse Cursor appearing forcing me to toggle through the steps with my keyboard and the older versions work just fine but "aren't supported anymore". Where have I heard that before?? Now it's 2017 and you still have to rely on that stupid outdated CLI for problems such as this minor hardware glitch. 2017 and we still need the CLI instead of a much faster user friendly GUI?? Back to Win 7. It reminds me of using DOS commands on my commodore 64 back in 1979/80! If you do a Google you will notice a lot of comments about having to struggle with this as a turn off for most that are considering an alternative such as this "free software"