I'm new to linux and recently installed Ubuntu 12.10 alongside Windows on my laptop. Initially 3D screen effects (i.e., Docky) were not working and I tried different things like installing and reinstalling nvidia-current, compiz etc... Now I think I messed up the display drivers completely... I can't get any screen resolution other than 640x480. Can anyone please tell me how to find out exactly what's wrong and ways of fixing it?