Im using Macbook white unibody late 2009 version.
Yesterday i used bootcamp to install win7 64bit.
I partitioned 100GB from 250GB total HD.
Anyway i failed the installation. So, i dun bother it, leave it alone, will get win XP on it.
I saw the partitioned 100GB was full of win7 files, so i itchy and format the partition.
Now, i gt my XP. When i run bootcamp again, it pops up this:

The startup disk cannot be partitioned or restored to a single partition.
The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows.


What can i do now?
Help >.<