Any way avoiding formating when installing windows

Hey
I went to partiction my hd (when running boot camp) it said that there was a error and asked me to reformat my hd and then try again. is there any way of avoiding this?

Oh boy, something seems to have gone wrong. Was this error message given by the windows installer or by Apple Software (i.e., Boot Camp?).

it was gaven to me after i tryed to partiction.
Boot camp.
this is very weird. because i tryed it one before and it did it just fine.
and then i undid the partition. but yeah it was from mac.

Having trouble with boot camp

i have tryed to run boot camp the other day. and i i tryed to partition my hd it said to refomat and try again.
the weird thing is that i have ran boot camp once before. and it partitioned just fine. but then took the partition away.
is there any reason for this?