How to make my application run in windows 7

Dec 23 2014 9:32 PM

HI,
I have developed a windows application in c#.net using VS 2013 and my os is windows 8.1 and if i install the .exe of my application in windows 7 i see lot of changes in the buttons and fonts and even in my ribbon menu how to make my application compatibility in all OS.
Hoping for all ur helps guys...guide me fast//..