Can i apply for an e-2 visa while in the us?

i intend to buy a small business by invest about 40000$ i'm not sure yet about the type of the business.
i have a french passport i know that i can stay up to three months without visa.
can i change status while in the us?
how long it take?
can i start work on my own business while apply the visa?

Answer:
If you are here legally there should be nothing to stop you from going to Immigration and naturalization and getting the balls rolling!

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