Help, Windows display setting keeps resetting after startup
 

On startup of my computer the monitor screen displays normal sized icons, then enlarges to gigantic icons.

After all programs are started I right click on the screen and click on properties. Display properties open, then I click on settings and move the slider to my likings, I click apply and the desktop reverts to normal size and operates in all areas normally.

The problem is I have to perform this task every time I restart my computer. It's obvious that the apply/ok setting in the display properties setting is not sticking.

Is there a fix for this condition?
Please HELP. Running Windows XP.
Thanks.