New splash screens

[Dave]

I upgraded from Feisty and everything worked straight away with no 
problems to my system. I have now got a Nvidia  splash screen that I did 
not have and after the sign in screen my monitor shows a blank desk top 
colour as it loads the desktop in till my wallpaper is used. Can I get 
rid of the Nvidia splash screen and change the horrible colour of that 
loading screen? I am a novice so I am afraid you will have to guide me 
through the steps.

DaveT