I installed this program on my laptop, but it doesn't work. When I launched it, it gives information about "Invalid Skin Error".
You've probably downloaded a version that uses a custom skin and because that custom skin wasn't installed properly, you receive an error. I advise downloading the official installation package from the official website of the developer. I have saved and installed it on my computer and it works flawlessly.
Download page: http://www.virtualdj.com/download/