Rollercoaster tycoon 2 download from direct2drive not working!?

I just purchased RCT2 from D2D and I can't even get it to work, i have been through almost all of the troubleshooting options the d2d website offers and i still cannot get it to work, its a little annoying that you pay for a product that the company says should work but they then make u jump through hoops just to play it.(sorry for venting) any help will be appreciated i just wanna play the damn game i payed for.