I am using a portable DELL Dimension 4600C desktop. It has Windows XP Home SP2. I had formatted the system to install XP back. It was working slow. After fresh installation I do not know what happened the resolution is not getting fixed. I cannot modify the resolution at all. It looks this desktop is not ready to accept the vga driver that I am trying to install. I checked for viruses and run other driver updates. Everything worked. The VGA driver is the only that failed. I did a mistake. I had not copied the old drivers. I forget to take the backup. I hope there would be some way to install video driver in the system.