It probably didn't work because you didn't do step 7 from the kb, which is to re-apply SP3 after Boot Camp 2.1.
Even thou it says everywhere that SP3 is already applied, you should run the full install and reinstall it. For good measure, before re-installing SP3, remove Parallels Tools thru the Add Remove Applications in the control panel (this in Boot Camp).
Also, I don't know what you mean by 'recovery disk'. A slipstreamed Windows XP with SP3 CD is not the same as a recovery disk. A 'recovery disk' is usually a cd that comes with a computer with windows pre-installed and it's just an image of the default installation and not a Windows XP installation disk.
In order to do the repair install successfully you need to use a Windows XP installation cd for the slipstreaming.
Last edited: Oct 11, 2008