Is Windows 7 x64 desktop background cached?

My issue is that despite I changed desktop background image to a custom one fitting my screen resolution of 1920 x 1080 pixels (in C:\Windows\Web\Wallpaper folder) this new image is actually loaded somewhat after system startup. I can see the old background image being already loaded when the desktop is first displayed and then, after several seconds the background image is swaped to the new one. I can't find the way to get rid of the old desktop background being displayed at the system startup.

Is the background image being cached somewhere or what?

Any ideas???

Rgs,
Ziggi

Indeed,

Removing >>Images<< registry key was the right solution.

Thank you!