hi i have registered for a ph.d program..but, i am still sitting with literature review and tryin to find out what problem i should take up and work..
can any1 tel how to choose a problem, how to define it, and how to proceed further with it...

First you need to speak with your supervisor to define a wider area of work.

Then you need to conduct a systematic literature review to understand what has been done so far and how. Through the literature review you can identify gaps in knowledge: some areas might not be investigated or results might be contradictory.

Based on the above you organise your fieldwork/ data collection.

Hope this helps.