I was approved F1 amnesty 245i, priority date Mar.,2001..mother US citizen.recieved NVC.currently in the US y2000. wat do i do?

245(I) is not Amnesty. It allows some people to adjust status if they filed before April 30, 2001. See a lawyer and present all the facts.

K1 Shall I accept the separation from him or shall I file for divorce?

If you stay married, you are asking him to continue to blackmail you until you become a US citizen. I suggest, if you possibly can, divorce him.

There is no law on the subject, but I would advise caution and not to do work in the U.S. that you get paid for, even if they are depositing the...

Are all cases under admin processing denied and returned to NVC? What happens in that case?

No, but for a fiancé visa, you will need to contact USCIS to revalidate the visa, or it will be denied once it's pending 90 days.

I MAILED ALL THE FORMS AND DOCUMENTS TO NVC , IN HOW MANY DAYS I GET AN INTERVIEW LETTER?

I would guess about 2 months.

Where does immigration take people they arrest?

Check the ICE website, there are contracts with countless local and national jails and prisons.

You cannot go at all, you would need an F1 to attend university.

No, it should not affect any future visa application.

If I apply for a change of status to R1 (being in the US), could my B1/B1 visa be canceled if the case is denied?

Only if you are in the U.S. without permission.

Have you personally ever seen an illegal immigrant with a misdemeanor in domestic violence be granted citizenship?

Illegal immigrants are never eligible to file for citizenship.