If you're sitting down at a Mac and expecting to use it like a Windows computer, you're going to be really disappointed. Profoundly disappointed. When I've been asked "How do I...?" by new Mac users, I usually say, "You're thinking too much" and that's usually a good solution. Then again, that particular advice might not apply some users.
Like some other posters, my already limited reserve of sympathy drops a few notches when you're running a crappy P2P client like LimeWire and looking for warez, porn and burnable copies of DVD movies. I think it takes some level of savvy to do those things safely and properly, and the number of things that could be wrong are almost infinite. Are you downloading Mac apps, or just anything that strikes your fancy? How are you burning the movies? Do you have the right ports open on your firewall in order to connect to other LimeWire users?
As far as returning the iMac, you should ask yourself: If you were relatively happy and comfortable doing all these things on a Windows computer, why did you ever switch?
a movie is a movie right. . .not sure why it would burn and work with PC and not on mac. . .as far as programs I was actually trying to get mac programs. . .toast parellel ect. . .the reason i switched honestly was looks. . i was going to purchase a new PC and saw the mac got in a converstion with some people at the store and went with the mac. . .I just feel like 90% of the stuff out there is made for PC and in orde3r to get it to work for mac i have to jump through hoops. . .but time will tell ill give it another week or so. . .I really just want to burn movies