Boot Cam Assistant Cannot be used... +more troubles...

i may have done something wrong but let me first explain and your opinion would then be very welcome...
got my SL update this friday so i install it in my macmini (early 09), installation go well. It kep my boot camp partition unchanged and working relatively well. untill i install bootcamp for windows after booting up on XP.
I restart on OS X and it hangs for nearly 15min. the slowest boot up i've experienced so far.
Once i'm able to login to my OS account I no longer see the bootcamp partition on "start up Disk"'s system preferences. and when i attempt to run Boot Camp assistant i get this message ....
Boot Cam Assistant Cannot be used
You must update your computer's Boot ROM
firmware before using this setup assistant.
another message appears when i go to "start up disk" in system preference. Although i only see my OS X partition, when i click back on "show all" this message appears:
You can't change the startup disk to the selected disk
The bless tool was unable to set the current boot disk
What went wrong and what can be done to correct this very annoying ordeal.
i'm able to boot on xp by pressing "option" whilst restarting my mac. however, bootcamp on windows is able to see OS X partition.
Your help is appreciated.
thanks

nobody has anything to say about my problem???
should i have to re-install everything ? and can a SL update DVD allow an installation from scratch ?

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