Application has stopped Working Windows 7

Question

Hello all, 

My application is working fine on XP and Some of win 7 Pc, but some of clients's Win7 PC has encountered following error saying Application has stopped working.
here is the detail description of the error. I am not able to find any solution from google. 

Problem signature:

  Problem Event Name: CLR20r3

  Problem Signature 01: My App.exe

  Problem Signature 02: 1.0.0.0

  Problem Signature 03: 4f1e7fc3

  Problem Signature 04: System.Windows.Forms

  Problem Signature 05: 2.0.0.0

  Problem Signature 06: 4a275ebd

  Problem Signature 07: 1326

  Problem Signature 08: 39

  Problem Signature 09: System.OutOfMemoryException

  OS Version: 6.1.7600.2.0.0.256.1