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Windows Xp Doesn't have built in Frame Work
you need to upgrade / install framework to run your application or Make Pure C Language Application
Vista Has Framework 2.0 inbuilt
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Does Win XP have built-in .NET Framework?
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Why don't you, or you clients, want to upgrade?
Anyway, you cannot code for .Net 1.0 unless you are using VS2003 (I think). I know if you are using the 2008 version of VS, then the lowest you can go is .Net 2.0