First, please make sure that none of the other troubleshooting articles applies to your problem.
If none of that works, take a look at our forums. There's lots of useful info there already, and more being added every day. If you don't find your answer there, you can post your question or send us an email. Before you do that though, this post lists the info we need to solve your problem. The more of it you can include in your message, the faster and more easily we will be able to help you!