Windows 10 support info

https://www.imageupload.co.uk/image/BVQZ

To quote from the OP's first post, "... I cannot run any game on my computer.". Might be an exaggeration, but who knows.

Also, the OP is playing the game via Steam, it is not installed on his PC.

You weren't told a page file was not needed with an SSD, but that it was not good to have it on an SSD. Both of those things are false.

Either create the page file, or buy more memory at this point. We don't have enough information about what's going on with your PC to tell you anything else.

I would still like to see what the memory usage is when that message appears. Start Task Manager (Ctrl Alt Del), More details, Performance tab, Memory. Also, the Processes tab will show what programs are using how much memory.

From that screen, you can click Open Resource Monitor (at the bottom of the screen), click the Memory tab there for more details on memory usage.

Steam has two options, local install (still need to log in to steam to play) or Stream from another PC on your local network. Streaming game content over the internet would be impractical as it would make their games libraries unavailable to about 90% of the world's population with slow internet (myself included). 

I have an HTPC built around the A75m board.

Since updating to Windows 10, HD Audio (ie DTS-MA and Dolby True HD) don't work. Is there likely to be any updated drivers or workaround?

any game such as install from disc or anyone of Microsoft built in games such as chess, solitaire mahong tiles etc.
none would run.