Best resolution for playing?

[Amarilyne]

I just finished my installation and went to login when I realized that my resolution was awful. My desktop typically runs 1600x1200 but I don't know what's the best resolution for full screen play. Everytime I tried to change it I got some error code and it crashed. Can anyone assist me in figuring this out? My son has about had it with me yelling for help from him for a game he played as a toddler.