Okay. Are you using Windows 8? You need to get in touch with PTC support. It is very possible your PC is not up to the task. Creo is very particular in this regard.
If your version is in fact academic, you can try submitting a support request (bottom of the page)...
http://www.ptc.com/communities/academic-program/technical-support
If you received the free copy of the trial version, you probably need to contact PTC support or the value added retailer that you received the Trial version for.