Yesterday I buy a Samsung Laptop model R538 but with Linux Julia preinstaled. I want to change the OS with Win XP. I begin the instalation and at the point in which I know he want to format the disk I get an error. Boot management ..... The hard disk it seems to be a Hitachi hts545050b9a300.It is posibile to be a problem with SATA. How can I pass this step? I repartitioned the disk, I let just one partition and still not work. same error. Many thanks. PS: Excuse my english

Solution:
1. Boot into Linux.
2. Use "fdisk" command to delete "ext" partitions. // In fact, no need to use other tools (e.g. killdisk)
3. Run "fdisk" command as root.
4. For those who don't know how to use "fdisk", I provide an example here. (Read the man page of "fdisk" will be better)

//Remember !!! fdisk can format your hard disk (which will erase all your data), use it with great care -- unless you know what you are doing, otherwise don't use it. (I will not take any responsibility of my suggestion)

i) fdisk /dev/sda
.) For those who use PATA (Parallel IDE) : fdisk /dev/hda
.) For those who use second hard disk : fdisk /dev/sdb (2nd SATA hard disk), fdisk /dev/hdb (2nd PATA hard disk), fdisk /dev/sdc (3rd SATA hard disk) and so on ... {sd [a, b, c, d, ...]}
.) fdisk "what" depends on where your linux partition is.
ii) use "m" to read the available options
iii) press "d"
iv) press the number of the partition you want to delete
v) Remember ! if you don't want to make the change, press "q" at any time. (that means quit without saving)
vi) If you want to make the change, press "w" (that means write the change to hard disk)
5. There may sometimes cause a warning message say something about not synchronize the disk (because you cannot make changes while you are using the partition -- if you are booting the partition now), the change will occur after you shutdown and reboot the system.
6. Okay, you can reboot the system now and you will find that the partition is empty now.
7. You can install XP or what ever now.

** For those who cannot use "fdisk", my simplest suggestion is to re-install Linux if you don't have any other tools (such as killdisk). And then you should be able to use "fdisk". In fedora 8, you can even choose formatting the hard disk in "vfat" file system (which can be recognized by almost all computer include windows xp and so on -- see "File Allocation Table" wiki) during installation. Therefore, no need to run fdisk