Re:
Hello,
If you can't boot into Windows because of incompatible display resolutions or frequencies causing no display, you need to boot using VGA Mode...
F8 before Windows XP loads, to display boot options...
...No need to boot into safe mode to restore display to basic default settings. Shouldn't need to uninstall graphic drivers either.
Instead, simply select to and boot the option Enable VGA Mode. Windows XP should load and when the desktop appears, it should be in VGA resolution of 640x480 and at a lower refresh rate.
The 'Enable VGA Option' in the Windows XP Safe Mode boot options is made available for occurances such as this. It sets your display to basic res and refresh rates.
Now you can change your display settings to the correct resolution and refresh rate which your monitor is compatible with. Your display is restored.
Make sure you check to make the system only display compatible refresh rates. Otherwise, you'll be doing this all again.