i suggest you give THIS thread a read..
http://answers.google.com/answers/main? ... &id=141224and pay special attention to the statistics.
if you are going to dream about winning the lottery, pay attention to what actually happens and avoid the bogeyman stories and the 'you're better off poor' kind of bullshit out there. having more money DOES make your life better IF you learn how to spend it.
after winning that kind of money, the first thing i'd do is hire a good lawyer and accountant. the lawyer to help me create a delaware or nevada corporation to transfer the wealth out of my personal name and into a business entity so nobody could sue me for the winnings. and an accountant (along with a good financial planner) to reteach me the art of thrift.
then i'd pay off my debts, fix my credit, and open a business credit line for my corporation. i wouldn't use it, but i'd have it just in case. fixing personal credit would be much more important though.
i would use my money to invest in dividend stocks and i'd let my accountant explain dividend stocks to me very carefully. then i'd have a financial planner buy the stocks for me. buying the proper dividend stocks provides a lifetime of payment and grows your money. well-chosen dividend stocks will pay you back what you paid for them in roughly 10 years, and the dividends continue to grow so you'd end up increasing your payments. in that way you would continue to get paid off of your winnings until you die (and beyond, for as long as the dividends are held in your family).
fixing credit and buying dividends would take between 2 and 7 years in total, but starting is more important than finishing because they are cumulative.
AFTER doing the above, THEN with what's left over i'd do the doodad thing (travel, car/house, furniture, jewellery for the lady friend, new threads, etc.)
THAT my friend is how to keep your wins and keep yourself happy. you'd probably do it different but that's what i'd do.