A lot of Windows games (most in fact) can be downloaded and installed with their installers from their respective websites or Steam, etc. Other games can be obtained in the Windows Store (green and white icon that looks like a shopping bag). Many Windows Phone apps/games have Windows availability also, and visa versa, nowadays.
In a lot of games you may have to lower the graphics options to make the game run faster and perform better - but that doesn't mean they won't still be fun to play. It really just depends on the game and how good you can make it look without sacrificing performance. You can test settings and then adjust as needed to get the ideal configuration for each game on your tablet. Some games may not run at all if the RAM (memory) requirements aren't met, as 1 GB is pretty low anymore.
That being true, many games will run pretty well with only 1 GB RAM. Be sure to close all other background programs you can to free up CPU/memory and disk I/O performance. You can also open Task Manager (shortcut is ALT CTRL DELETE) or right click on the taskbar to access it - and go into the Details tab and right click on the running game or application you want, and choose "Set Priority" and set it to "Above Normal" this will devote more CPU cycles/resources to that game or app, thus making it perform better and run a little faster. This isn't going to fix all performance issues but it may help a little bit.
Another thing to increase performance is close anything you don't need from the taskbar tray (by default in the lower right corner of the screen). If it is possible for you to run a Steam game with Steam closed (by going to C:\Program Files\Steam\SteamApps\Common\game name\ ) and clicking the game's .EXE file directly to run it without the Steam app running - it will further save CPU and memory and provide faster performance in the game.
It may help to update your graphics driver. The tablet uses an Intel graphics core. You can obtain the latest driver here or here. (Be patient because it might seem to freeze for a few seconds, give it a minute or so and it should progress forward and continue).
You can also disable unneeded things from running on login/startup to further increase performance. This is done via Task Manager on the Startup tab. Just right-click on the various items you want to disable from loading on startup and choose "disable" and they won't open on startup anymore. I already explained how to access Task Manager above. 🙂
Advanced Users Only: If you want to tune your system even more, you can run services.msc (or navigate to Control Panel\System and Security\Administrative Tools\Services) and set certain things to manual or disabled (since those you actually need these can vary widely do not adjust these unless you know what you are doing or look up what each service does or what requires it to be running). For a good guide, check out Black Viper's guide for Windows 8.1 here and for Windows 10 here. Again, please be careful and only adjust these if you understand what you're doing.
I hope these tips help! They should aide you in getting the maximum performance in games on your tablet. Good luck!