Hi!

i have a .NET assembly (executable). is there any utility or way to convert this .NET assembly to native executable? so that i can run executable on a system that does not have .NET framework installed.

No. You can't convert managed code into unmanged code.

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I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^
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