Thank you for the information and your question. I can say with virtual certainty that this is a scam. There are a few indicators here that it is. First and foremost, if you are receiving notice that you won a lottery or sweepstakes that you didn't actually enter, it is a scam. There is no such thing as winning something you don't enter. Secondly, and most importantly for your protection, there is no legitimate sweepstakes or lottery that will make you forward money to them, for any reason, before they pay out your winnings.
I can tell you that this "check" you receive, which I am guessing is for you to deposit and then pay "taxes, fees, handling, etc." is fake. However, it is a good enough fake where the bank personnel cannot tell and will accept it on deposit. Then they will credit your account as required by law and you will write a check or send a money order or bank draft, or some form of payment, to whoever the "sweepstakes" tells you that payment goes to out of the "check" funds you think you have. Unfortunately though within days, your bank and then you will be told by the Federal Reserve Check Clearing House, that the check was fake. By then the scammers have your money and they have moved on to another victim.
So, you do not want to deposit this alleged check and forward any money so that you can get your alleged winnings and may want to file a complaint with the Federal Trade Commission and the U.S. Postal Inspection Service (if you received the fake check in the mail) so that they can pursue criminal charges against these people.
You can find out more about these types of scams and how to file a complaint with the FTC
by going to: http://www.ftc.gov/bcp/menus/consumer/phone/prizes.shtm
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