Again you are "way off"!
The problem isn't with the XP boot.ini file. That is XP's own file. You already have file permissions for editing that by right clicking on it and unchecking the "read only" box. The dual boot selector was put there by a "NEWER OS" and is not XP orientated. No %^#&@ around???
Currently I am multibooting XP, RC1, and Eventually when lilo gets installed Zenwalk a Linux distro. Vista did install the "bootmgr" file onto the XP primary on the first install. With the primary disconnected aftter wiping that Vista copy saw a fresh installation with a new mbr on it's own. But all you can do is move the "bootmgr" file into a folder to get it off of the root of the primary drive. Even the Vista beta couldn't delete it until full permissions are set.
The bootmgr file is what shows at boot time to select Vista or the "older operating systems" option on the line above. Gee XP is booting normally now that bootmgr is buried in a useless folder somewhere!
