It happens many time in xp that we get 2 options in boot loader in which one is duplicate or not in use but it shows, in this regard i received many emails so i decided to write on it. 
Solution:- Press Windows key + Pause/Break Key Now goto "Advanced" tab and click on "Settings" button in "Startup & Recovery" section. Now click on "Edit" button and then you can edit the boot loader time, labels, etc.
Or
The easy one:- Type "msconfig" in RUN dialog box and goto "Boot.ini" tab and then you can change the desired thing. If you want to remove the corrupt/non-working entries, then click on "Check all boot paths" button. I hope you will now delete the duplicate entry
