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I would advise against withdrawal of your 401k. Presuming that you are under 59 1/2 and that you don't have any exceptions to the early withdrawal penalty---the 401K will be taxed at ordinary income rates (possibly as high as 28% or more depending on your other income) plus 10% early withdrawal penalty and state tax. You stand to lose close to half of what you have painstakingly invested, and still have credit card debt.
Please consider trying to negotiate a settlement with the credit card company (they may be willing to accept a payoff of a lesser amount) and see if you can borrow from your 401K instead of withdrawing the whole amount. A loan is not a withdrawal (as long as you stick to the repayment plan) and you will actually be paying yourself back.