Teamviewer crashes after installation

I've installed the latest version of Teamviewer 12 on my Windows 7 computer.   I'm been trying to use TV12 to access a remote computer that I want to use as a server for Windows Media Center.  It worked for about an hour then suddenly started crashing, and every time I try to start the program,  it keeps crashing.  I have since uninstalled and reinstalled the software -- even tried previous versions - multiple times -- even tried Teamviewer 11 but to no avail.  However, I can run Teamviewer 12 with no problem when in safe mode. 

Can someone provide me with some advice on how to fix the problem?