The blender program starts with a blurry interface Hello.
The screen is causing trouble and I am asking questions.

Because of the nature of the model, I can only use the old version of 2.67 version. 

When I run the program, I have a problem with the screen as if it were foggy unlike the latest version.
How can I solve this problem?
[For a new visitor to this page for the same problem ] Try installing 2.79 it will support your required plugin for which you are trying to install an older version and also won't give blurry effect on the interface. (Answered based on my personal experience with the same problem.)