Angels have the Phone Box
Let me first say that I am sorry to hear about all your frustrations with the upgrade to W10.
That being said, I will tell you that a 4-year-old computer will run W10 famously if clean installed, instead of upgraded from W7. I have seen numerous problems with W7 to W10 upgrades, all of which were resolved with a clean install. There is just too much baggage from a W7 upgrade to deal with.
The members here will certainly help you do this, if you're willing. Or, you can take the machine to your local PC shop and have them do it. Just be sure your data is backed up, and you have any install media and keys for any paid software. We can also get your older games working again.