Screen Resolution Issues on ATI Rage 128

I am using a Dell laptop with Windows XP installed. I observed that when starting new programs gets started automatically and my screen resolution changes with desktop icons and size.
The screen resolution changes form 1024 x 768 to 640 x 480. Although I can changes those setting but unable to save them and make them stay. This happens every time I boot my system. I have an ATI Rage 128 Ultra Video Card and the also updated Video Drivers.
I believe the Video card driver is working fine. I tried my best in getting screen resolution but unable to save those settings. I have no clue and if someone can suggest me how to get this done.
