you can use an XP Home disk to run the recovery console on an XP Pro installation, someone correct me if I am wrong on this. I don't see any reason why this wouldn't work, though.
I would go ahead and run the repair console and type bootcfg /rebuild
, and then exit the recovery console and see what happens.
To do this, boot from the Windows XP CD (usually you just put it in your cdrom and reboot, and it will give you 5 seconds to "Press any key to boot from CD."). Let it load up, and you will be at a screen that says "Press enter to setup Windows XP now", and after you hit enter, you will be at this screen:
Type "R" on your keyboard to enter the recovery console. Now, it will ask you what windows installation you would like to log on to. Normally, you would just type "1" here, unless you have otherwise named it.
Now, you are in the recovery console. Type bootcfg /rebuild
as stated above, and press enter. Once it has been rebuilt, type exit
and hit enter to exit the recovery console and reboot. This time don't select to boot from the cd, just boot normally from your hard drive and see if it works.
Hope this helps!
EDIT: Thanks dexta182 for catching that.