No ideas about that problem, I haven't run into it.
Here's my boot.ini for you. This was automatically generated by the parallels tools for boot camp, the only change I made was the value for timeout.
Code:
[boot loader]
timeout=10
default=multi(0)disk(0)rdisk(0)partition(3)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(3)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect /kernel=ntkopvs_.exe /hal=halopvs_.dll
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Parallels configuration" /noexecute=optin /fastdetect /kernel=ntkppvs_.exe /hal=halppvs_.dll