This is a known issue in certain operating system set ups in Windows.  Its a permissions/compatibility issue that can be resolved by running the program as Admin. 



1. Right click on the ViaCAD/Shark icon and select properties 

2. Click on the compatibility tab

3. Check "Run this program as administrator."

4. Apply the changes and click okay. 



Launch the program and you will be asked if its okay to make changes to the computer (typical admin question). Simply agree and the program will run.