Wait, you're saying that icons changed because of the game? It wouldn't do that at all -unless- you got the game from an unofficial source. If so, you really have to be careful about things like that, especially because there is malware going around that encrypts your files and the only way known to get them back is to pay a large amount of money as ransom. It's called Cryptlocker, and has many variants.
Why don't you try running this command from an elevated command prompt, to see if the icons return to standard Windows ones:
sfc /scannow
Also, a good scan with Malwarebytes is probably in order to check the machine for any undesirable files or entries.
But in your screenshot, I don't see anything wrong there - but - I don't have a Windows 8 install here to compare to.