If I won the lottery, I would first finish my accounting since I only have 3 months left. I obviously wouldn't claim the prize until after graduation, as my state requires disclosure of your name and going to school when everyone might know I'm loaded is a bad idea.
I would also quit my job, although not right away as they've been most excellent to me and it'd really fuck them over to deuce out with no replacement hired.
Finally I would start up a charity to keep myself occupied. Definitely need to keep working and heading up a charity would certainly fit the bill. I would fund the majority of the charity so I don't have to deal with fundraising. The charity would be providing financial assistance to low income people. It'd cover the staples like rent and utility assistance, but I would also like to do less common/random things like funeral assistance, car repairs, disability renovations of a house, etc. I would also try to have less restrictions incomewise, growing up my family was poor enough to greatly struggle but not poor enough to qualify for assistance.
Anywho that's what I'd do. What better thing to blow money on than helping the local community?