Hi,
If there is any third party software uninstall the same and check if that helps.
You may follow these below steps to set the picture to its actual size while viewing and printing.
To view the picture at its actual size, click Actual size . To make the entire picture fit in the Windows Photo Viewer window, click Fit to window.
For more information you may visit this below provided help article.
View and use your pictures in Windows Photo Viewer ****http://windows.microsoft.com/en-US/windows7/View-and-use-your-pictures-in-Windows-Photo-Viewer
If you wish to have more features with Pictures on your computer then you need to install Windows live photo gallery and check if it has the features you expect.
Windows Live Essentials: Photo Gallery