Actually, wat temeteus82 said is true, when u turn ur pc on ur XP drivers dont just load right away, bios has to find the boot code to start XP, the drivers fix this when XP is fully loaded (log on screen) ...

this happens to all video cards that have multiple outputs, I have the same exact card and it did the same thing from when I first installed the card and booted up the PC. Aslong as u have the output connected and No OS to Support multimonitors, the card will show all, if it bothers u that much just turn your TV off when u boot ur PC... other than that there is NO fix for this as this is in fact NOT A PROBLEM.
Get it?
