Use your XP CD to open the Recovery environment and add this syntax to Boot.ini /NoExecute=AlwaysOff
Insert your XP CD and when you see ?Press any key to boot from CD? press a key. Now wait for the XP installer to finish loading up and you will be presented with the option to press R to Repair.
Press R.
The next screen will ask you which Windows? installation you would like to log on to. Normally the following will be listed:
1: C:\WINDOWS
Press 1, then Enter to continue.
You may now be asked for the Administrator password. If you know this type it and press Enter. If you don't know the Administrators password it may be blank. Just press Enter or type your username and password.
When you get into the Recovery Console you will be at:
C:\Windows
We need to change to the C:\> prompt
Type CD .. and press Enter
Type ren boot.ini boot.old and press Enter
Type bootcfg /rebuild and press Enter
Let it scan
Total Identified Windows Installs: 1
[1] C:\Windows
Add installation to boot list? (Yes/No/All)
Press Y and then press Enter
You receive a message that is similar to the following message:
Enter Load Identifier
This is the name of the operating system.
Type XP Access and press Enter
You receive a message that is similar to the following:
Enter OS Load options
When you receive this message
Type /fastdetect /NoExecute=AlwaysOff and press Enter
Type eXit to exit the Recovery Console
Restart the System and you will be presented with a choice of Operating Systems. Select XP Access.