Error installing application in some machines

Question

I have a windows application developed in C# with c# express edition 2008.
I have published this to my web server and the files are installed by client from there.
The application is getting installed and working correctly in almost all the machines. But in some machine, which are fresh system without much installations i am getting the following error
Description:
Stopped working

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: testapp.exe
Problem Signature 02: 5.1.0.82
Problem Signature 03: 4976b6a1
Problem Signature 04: System.Windows.Forms
Problem Signature 05: 2.0.0.0
Problem Signature 06: 4889dee7
Problem Signature 07: 199c
Problem Signature 08: 2
Problem Signature 09: PSZQOADHX1U5ZAHBHOHGHLDGIY4QIXHX
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 1033

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can anyone tell me how to identify the excat problem from this eror message. I am getting this in windows vista machine

Thanks in advace
Hari Krishnan
www.techiebuddy.com