Sorry to hear you are experiencing problems with CrazyTalk 7.
Please do make sure that your graphics drivers are up to date and that your computer meets the minimum specifications which can be found HERE. Graphics drivers are the most common cause of problems so do check this first.
If all your drivers are up to date and your computer meets the requirements, then please contact Technical Support using the link below. They will be able to advise you further as to how to resolve the problem.
http://www.reallusion.com/CustomerSupport/User/QForm.aspx
Peter
Forum Administrator
www.reallusion.com