partitions letters changed after win7 installed

Hello,

i have dualboot os. win xp pro and win7 ultimate.

my original partitions letters is like that:
c-win xp
d
e
f-win7

after i installed win7, when im using win7 the partitions letters had change:
f become c - win7
c become d -win xp
d become e
e become f

when im using win xp all the partitions letters come back to original.

how can i keep the original partitions letters on win7?

tnx
david.

Window 7 always resides on the C: drive

thank you.
so there is no solution to this behavior?
why the other partitions change there letters?
how can i keep the changing only beween c & f partitions?

tnx again.

You can change all the letters you want if you Go to Stuart > Run, and type diskmgmt.msc

Could you provide a s screen shot on Disk Management Make the window bigger so we can see all partitions