C#.net project generate file not found exception in vista

See more:

C#

hello everyone,
i need one suggestion, actually my C# project developed on vista
32-bit i3 system generate error on vista 64-bit AMD processor system.
error is .........

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: myapp.exe
Problem Signature 02: 3.0.1.5
Problem Signature 03: 4e33b2b6
Problem Signature 04: mscorlib
Problem Signature 05: 2.0.0.0
Problem Signature 06: 47577b16
Problem Signature 07: f8f
Problem Signature 08: 80
Problem Signature 09: System.IO.FileNotFoundException
OS Version: 6.0.6001.2.1.0.256.6
Locale ID: 1033

this one is error and as i searched about it i found one of dll may be not
found related with excel file creation module.
but i added microsoft excel 12.0 object library
so which one dll is missed. plz tell which dll i have to add now. and my project
run on win7 64-bit amd processor system.
so give me any suggestion if u know about this error

thank u in advance :)