I'VE FOUND the SOLUTION. Lim, everything you just described matches my had-been problem 
precisely. I'm using a Windows XP with Nvidia Geforce2 MX/MX 400.

Guys, try this out. It might work. Certainly, it changed my default monitor back 
to the correct one. Now I can once again lower the screen resolution to 800x600 without 
"getting out of frequency." Ever since this problem I couldn't find the Monitor subheading 
in Device Manager. Yes, even from Safe Mode. Yes, same as what Scott's having. Fortunately, 
that's over thanks to this solution.

This started ever since updating my card with Windows Update. Unfortunately, System 
Restore was no help. I warn you, never use Windows Update for driver updates. Instead, 
find your driver's manufacture site and use that.

ANYWAYS, THIS IS MY SOLUTION:

I went to http://www.nvidia.com/object/winxp_2k_53.03 
(opens in a new window) for the latest version of my graphic 
card.

Yes, it contains the software. But we can stop it from automatically loading by using 
< Run...: "msconfig" > and going under tab < Startup >.. etc.

The package installed itself to  C:\NVIDIA\Win2KXP\53.03  [well, it's v53.03 as of 
now]. This is where the VGA controller is at, etc. Keep this in mind. 

Time to knuckle down. Go to My Computer's < Properties > ; tab < Hardware > ; &, 
button < Device Manager >.

Reveal the hidden devices by going to "View" -> "Show hidden devices."

Now skip to the "Non-Plug and Play Drivers" sub-category and uninstall VgaSave. ! 
Do not restart yet !

Then skip to the "Display Adapters" sub-category and uninstall what's under there. 
Trust me. ! Do restart as prompted !

After the restart, your Plug and Play will detect something called VGA Controller. 
Do not tell it to search from a CD or the internet. Instead, tell it to install from 
C:\NVIDIA\Win2KXP\53.03  [remember?] This should automatically install the VGA controller 
and your graphic card. ! Do not check up on your default monitor with Display yet 
!

Restart your computer.

After the restart, check up with "Display" -> "Settings."  

  :)  

I'm asking you a favor now. Ever since the driver update with Windows Update, there 
was the "default monitor" problem and now, still the "I've-got-invisible-and-displaced-tabs-in-Display.Settings.Advance" 
problem. LOL. But seriously, please... I need someone's advice. I don't want to re-format 
my computer.

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