If you are properly performing an upgrade to Windows XP
Professional, there should not be a selection to boot to
two different Windows XP Professional operating systems.
Are you sure you are selecting the default "Upgrade" setup option?
To correct your issue:
Go to Start > Run and type: MSCONFIG , and hit enter.
Click on the BOOT.INI tab and then click on "Check All Boot Paths"
to delete incorrect boot paths.
If the above does not correct the issue, then:
Right-click on MY COMPUTER and select:
Properties > Advanced > Startup and Recovery Settings > Edit
CAREFULLY edit your boot.ini file.
Your boot.ini file should then look similar to this:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect

Signature
Carey Frisch
Microsoft MVP
Windows XP - Shell/User
-----------------------------------------------------------------------------------------
| Hi,
|
[quoted text clipped - 8 lines]
| THank you!
| Jon