due to exel namespace password generaton sotware in install in xp

hello, I develop password generation software in c#.net2008 and operation system use windows vista and my software easily install in windows vista,windows 7 but problem is that it is not install in windows xp.
show this error---
Error signature:
Event Type : clr20r3 p1:password generation.exe P2:3.1.3.4
P3: 4d947143 p4:password generation p5:3.1.3.4
P6:4d947143 p7:1 p8:e p9:system.io.filenotfoundexception

but if i remove these namespace , it install in windowsxp also:
//using Microsoft.Office.Core;
//using Excel = Microsoft.Office.Interop.Excel;

plese help me how i remove this,error
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Posted 8 mins ago
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