The same thing happened to me when i first got nolimits..all I have to do was update my drivers with one that was compliant with opengl graphics.
to see what you have, right click on the my computer icon on your windows desktop and click properties --> Hardware Tab --> Device Manager button --> Display Adapters
actually better yet, Right click on your desktop --> properties --> settings tab --> advanced button --> adapter tab
copy the information that it says there and paste it here
also have you gone to the manufacturers website and downloaded/installed the latest driver? you could also try over writing your current driver incase there is something wrong with it