TBC Financials / Terrible experience

I got a letter from "Gotcha Financials" -A division of G.P.C. INC 543 91st Ave NE Unit F Everett, WA 97865 phone # (647)890-3656 (which I find is in Canada). There was a check for $4, 755.35 enclosed stating it was 3.8% goverment recommended taxes on your winnings. Also It said my name was randomly chosen through a computerized ballot as a winner of the FOURTH QUARTER of 2008 Sweepstakes drawing. I called them right away to find out what the catch was, and got a very rude lady on the phone that answered. I told her about the letter and she rudly asked for my claim number. I gave it to her & she put me on hold for 5 minutes. She got back on the phone to tell me she activated my check & I could cash it. Then she went through this scripted congradulations in a very rude voice & told me to call them after the check was deposited so they could give me some tax information. After she was done I asked "is this check real?" She responded "It is 100% real". I told her I've been scamed before, & she was silent on the other end, then I said O.K. I'll call tommarow. No response just silence on the other end. I hung up and stupid me was excited. I took the check to my bank, & had the manager look at the letter & check. He said it was probably a scam, & not to deposit the check, but to call them back & tell them I did. I will call them tommarow to see what they say. The bank manager said if they ask me to send money, or anything like that then I would know if it's a scam. I AM SO PISSED AFTER COMING TO THIS WEB SIGHT TO FIND THIS IS ANOTHER SCAM! I WILL DO EVERYTHING IN MY POWER TO BUST THESE PEOPLE. IN A TIME OF RESESSION, & HOLIDAYS, HOW THE HELL DO THESE PEOPLE GET AWAY WITH THIS? I FEEL SO BAD FOR THE PEOPLE THAT GOT SCREWED BY THESE PEOPLE.