[ubuntu] Problem in dual booting (Windows asking for Windows)

Hi friends,

I purchased Iphone5 and thanks to apple I have to dual boot my system. I have 5 partitions in my system. The smallest partition which I don't use is of 5GB (I keep it for testing other linux distros) Now I want to install Windows XP in there. I made a bootable pendrive of WinXP and tried to boot using that pendrive. It booted successfully but I got a message something like this:

Any suggestions what can I do?

Note: I have all the partitions in ext4 format. I just thought about it, could this be the reason? I'll go home and test it today, but it'll be great if anyone can confirm this. I thought that I'll format that partition. to FAT or NTFS during installation.