She seems eligible to immigrate under 204L for applicants in the U.S. when the sponsor dies. Contact an attorney to review in full detail.

Can I use my old approval notice?

Interview on the I-130? What is it being submitted for?

What is the longest it takes to receive the work authorization card after biometrics ?

It should take 90 days from the date of filing unless there is a request for evidence.

If someone is having an affair while their spouse is sponsoring them for a green card is that considered fraud?

It is possible evidence of fraud. Even marriages entered in good faith can have this happen.

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I want to apply for asylum in Minnesota. interview will be in Minnesota or in Chicago? how can I find out this?

I do not believe the Chicago asylum office handles Minnesota applications. They do handle applications for Illinois, Wisconsin, Indiana, Kentucky,...

Is there any interpreter at chicago ohare international airport port of entry immigration for non-english speaking people?

They have interpreters available if needed.

Visa extension for dependents in Home country

Have her apply for an L2.

What kind of financial support do I need to show to the embassy for bringing my family here? (US citizen applying for greecard)

Your evidence of income must be your tax returns and current letter of employment.

Generally you cannot be approved if you owe taxes. Pay the taxes and send proof to CIS so you don't get denied.

Refused entry and opted withdraw but still CBP officer mistreatment at O'Hare airport 12/23/2012 2115 hours, need justice done

File a complaint if you feel you were mistreated. Check the CBP website for what to do.