DESKTOP ICONS MOVING

Hello all,

This is more of and annoying issues than a critical one. I have arranged my desktop icons, however when either 15 minutes goes past, F5 is pressed, logoff login or restart happens all of the icons rearrange themselves down the lefthand side of the screen. I have unchecked Auto arrange and Lock Web items on the Desktop. I have recreated Local and Roaming profiles and still this annoying problem happens.

I am using Win Xp SP2

PLEASE HELP! What can i do?