You can refile, or if you are in removal proceedings, you can get a stamp at an infopass.

Yes, TB positive is a basis to have the application denied, as it is a ground of inadmissibility.

Does an invalid marriage which affected the I130 petition for a spouse also affect a petition for a step daughter ?

It depends on the jurisdiction. Some places will validate a marriage once the impediment is removed, and others not, and it certainly depends on...

Fastest way to immigrate for unmarried son of a US citizen who also hold non immigrant visa and have not filed I-130

You may be eligible to file for citizenship on form N-600K, depending on your date of birth and status in the U.S.

My husband's finances are such that we will probably never be able to file Adjustment of Status.

You may be eligible for state or local benefits, and of course, the country of which you are a citizen is responsible for your wellbeing.

Can I change my visa status from L2 to F1, while my Husband's H1 got approved week back. I am a MS student presently.

Generally people can change for L2 to F1. The issue is whether you are currently in status.

I visited the states recently for a week without realising my company had started my L1 Visa petition. what are the implications

No, visiting the U.S. does not make you ineligible for an L1 visa.

Marriage based green card for persons in the US and have TPS and pending asylum , what application should i submit I-485or I-130

At issue is whether you were admitted or paroled into the U.S. If not, you cannot file for adjustment of status.

If stopped at point of entry, how long is the bar

No, you only get a five year bar if you are given an order of removal at the border, not if you agree to withdraw your application for admission.

My Wife Having H4 visa valid till september 2015 and she also having H1 visa from her employer till September 2014.

If a change of status is granted, from H4 to H1b, she is an H1b. If she enters on an H4, she is an H4 and not an H1b.