The lines aren't a problem, they are interlacing. They should
be there. I realize that doesn't sound right, but it is true. When the footage is played on a television, the lines won't be visible. Once your project is complete, it should be de-interlaced if you intend to upload it or view it otherwise on a computer monitor. This is explained in detail, with images, in the article that was originally linked
. Also www.100fps.com
has some good info.
Also, you have provided no additional info about what the problem is after the help you have already gotten. Some info about the format of your footage, the project settings you have tried, what didn't work, or anything of that sort would prove helpful in finding a solution.
If it plays at the wrong speed, whether you are talking about within the project or rendered footage makes a big difference. If its the rendered footage, it almost certainly confirms that you have used the incorrect project settings. This article
deals with that specific problem.