Comment by pekka.klarck:
Vlad.Sanchez, it seems your Python installation is somehow messed up. Can you run e.g. 'python -V' successfully and start Python interpreter by typing just 'python'?
Running 'ride.py c:\' may not be that good idea either because it will open the whole c drive as a test suite. That shouldn't have anything to do with your problem, though.
For more information: http://code.google.com/p/robotframework/wiki/Installation
