Dual Boot Windows XP / Vista

I'm having problems to set up dual boot!!
After installed Vista, it doesn't find my other windows, so it doesn't show the boot menu so i've tried a diferent thing I activate my partion of windows XP and it boot again then I put Vista in my boot.ini, but it doesn't work Vista don't go up!!
it tried to start, because after that i activate again vista partition and it ask me if want in safe mode or last configuration that worked!! saying that the last time something wrong went up.

Txs
 
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