that being said, you never know how a W on your transcript will affect your future - be in grad school or employment. Often if your transcript is requested for a competetive job or program, they WILL ask about your W if you have one - mostly why you withdrew and what you did instead (to make it up or otherwise). In general, at least at my college (Dartmouth) a W is not good to have.
Just get your shit together, be responsible, and fuckin drop classes before the deadline - at most colleges you have at least 2 or 3 weeks at the beginning of each term to do so.