I can't guess if this is that HP laptop issue. On some HP laptops you need to install a patch from HP to enable some of those settings to stick around.
In the future a little more detail so guesses don't have to be wild guesses.
I have tried numerous times to change the background picture on my new laptop with Win7 and it will work for a short time then for no reason at all it will revert back to a white background and it will start making sounds again when I have it set as no sound. Also it will not save my changes on my personalization page. Could someone help me because everytime I write Microsoft they tell me to do something I have already done