First thing i am assuming is that u have the latest display driver installed..
it looks like u must have enabled certain features in ur Nvidia driver software.that must be causing the interface to look like this...it happened to me once wen i was playing doom3...i had installed the latest graphic driver and had enabled a feature called Extension limit...which caused the game to crash...disabling the feature solved the problem...
In ur case do the following:
1)go to the control panel of ur display driver where u advanced controls of ur display are displayed.
2) disable one feature in the panel...say Anti aliasing...keep the other features enabled
3) start the game...and c whether u encounter the problem again...if the problem persists...exit the game and go to the advanced control panel of ur display driver again...
4)Now enable Anti aliasing and disable the next feature... keeping the other features enabled...and start the game again to c whether the problem persists..
Repeat steps 2) and 3)...till u find (may be) the solution to ur issue...
But I will say this...the solution i proposed above is not a guaranteed solution to ur problem...but it might solve the issue...
If the above solution also doesn't work..the issue might be something else...:S :huh: