There is no supported or repeatable method that works in all cases. So you could try something. You can always reinstall the game you tried.
As to the RAM, you should make a new post with all the details. And let's hope you are not looking at some outdated software that only reports 4GB. In your first post you wrote "In control panel - system and security - system it says I have 8.00GB of installed RAM 7.78 usable."
So if you installed some other software that is 32 bit, it will report 4GB. This may be good for the PC support industry and I'll take that bet that someone will pay for tech support to ask why.