if you loaded the OSs separately, then they have two MBRs.
Use the app Makaveli213 suggested, and simply put both OSs in the MBR with it.
by the way... thanks for the app tip Makaveli213... it truly is a sweet lil proggy
to avoid this in the future, make sure to leave both HDDs in the computer when installing the second OS, then the installation will detect the first OS and just modify the boot record
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