Help? Do I need to change screen resolution?

When i load my texas hold-em game, the window loads fine but the actual game window is tiny in the top left corner. I can't get it to be the regular size, I've tried removing it and re-adding it and that didn't work. Maybe changing the resolution would help? How do I do that?Help? Do I need to change screen resolution?
right click on desktop, choose personalize, then settings



choose properties on Windows XPHelp? Do I need to change screen resolution?
Click on the game settings try changing the resolution, it might work
For all Windows

Find Control Panel

Find Display Settings

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