You probably did not read the tutorial. You should, considering the effort put into it by its author.
It is quite normal that Vista become inaccessible after you've installed XP. You need to run a (free) program such as EasyBCD at this stage in order to reset the boot sector properly.
I attached my procedure which describes how to finish off the installation (works without Vista DVD). Start at item # 10 of the procedure.
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