I would start by going into shock!
Then hide,
secure the funds,
start a business by investing in properties to rent,
of course pay off all my bills and gift some $ to family members,
donate to a few charities and BFP,
likely buy a new car, no more than 2.
develop an organization to help single mothers acquire their own home, nothing like Extreme Makeovers.....but something to be proud of!
above said organization(s) will need a few employees,
depending on the amount I won, I would travel the US of A and after a year or so extend my travels across the pond!
I might even dabble in hiring the "Millionaire Matchmaker" to help search for Ms. right!
Wow, this list could go on and on.......