Try Windows 7, at least until Ross-Tech releases a version certified to be able to run on Windows 8. At least this will tell you if it is a Windows 8 issue or a Mac/bootcamp issue. Also Ross-Tech does not support running VCDS is a virtual machine. If it works, fine; but R-T does not officially endorse or support such use. This is all in the FAQ. http://www.ross-tech.com/vag-com/faq_1.html
Have Fun!
Don




