If you have not yet reviewed the Read Me files, I suggest that would be a good place to start. For answers and assistance with specific problems please provide a bit more information, such as a description of what you have done, results of those steps, and most importantly information about your computer OS (Windows/Mac version).
iMac i7, OS 10.8, 10.9, W7
VDL2.5.5, Finale 2010-14
Kontakt 4-5, various other soft synths