triple boot sys

[Bernie]

i have a triple boot sys. windows ,mandrake ,Ubuntu when down loading up 
dates to the kernal in ubuntu grub took over the boot loader an changed 
it to only see ubuntu how do i fix this mess.Is there any way that it 
can be locked so this wont happen again.I do not want to lose excess to 
my data Evan for a short time it could cost money.

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