Invalid Boot paths
The traditional method of removing the invalid entry is to manually edit the boot.ini file, but XP provides an alternative method that eliminates the danger of manual editing by using the System Configuration Utility.
To Remove the Invalid Entry
Click Start > Run
type msconfig and click OK to open System Configuration Utility
Select the tab labeled BOOT.INI
Click the button labeled Check All Boot Paths
A dialog box will open detailing the location of any invalid operating system locations.
Confirm you want to remove the entry and reboot the system.