Hi! I'm Eric, a computer expert who's been paired with you through JustAnswer.com. I'm reviewing your question now, and will return w/ an answer soon!
The System window will appear. Scroll down until the System section of this page is displayed.
...and that will give you the first part of your answer (that is, you'll know what version of Windows you have)! If you would, please post back here and let me know what game you're trying to download, and I'll see if I can assist with finding the right download file.
Hello again! It's been awhile since we chatted, and I wanted to follow up and make sure that the solution I provided worked for you? When you have the chance, would you kindly let me know?
Thanks so much, and I look forward to hearing back from you!