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Hi again,

My power window on the driver's seat suddenly is not working..Other windows are working properly. What can be it's problem? Where and how much can I buy the parts needed (if any) for replacement to fix them? Thanks!

There could be a number of possible causes (ie; switch, wiring, window motor etc). Therefore, it's impossible to say what parts you might need or how much they might cost.
You need to have the problem diagnosed by an auto-electrician (or perhaps a BMW specialist if there's one in your area) to determine what is wrong and the likely cost of repair.