Some users have reported difficulty starting up Paradox Vector. According to the developers of the game's platform (3D Gamestudio) this can happen if the computer's DEP settings are set a certain way.
Here is the way to fix this issue:
Check how the DEP (data execution prevention) is set in your Windows configuration. Go to My Computer / Properties / Advanced / Performance / Settings / Data Execution Prevention, and make sure that it's in its default setting ("For essential Windows programs and services only"). A wrong DEP setting prevents on-the-fly compiling lite-C or C-Script source code.
I believe there is also a way to keep DEP settings customized, while making exceptions for certain programs. Either way should allow the game to start up correctly.
Let me know if you've experienced this problem, and if you were able to resolve it with this information.