how install windows when the system have linux

Clarifications

dear no way to do this.

To do this you need to install Both Fedora and Windows to different HDD or Partitions on the HDD.

I would suggest starting from Scratch and depending on what you actually have in the way of HDD Space to either format the HDD into 2 Partitions of the size that you require or install a second HDD and install Feroda to the second HDD.

When you power on you will be prompted to chose which OS you want to boot into and you do this by highlighting the required OS and pressing Enter.

If you have to start from Scratch I would suggest Installing Linux first as it has a better Boot Loader than Windows and it will setup the Dual Boot Option without any Intervention of the user. After you have the First OS installed you then proceed to install the second OS to the Unused Portion of the HDD or Partition. On every restart you will need to chose to start Windows till it is fully Installed.

Col

If you aren't very familar with Linux there is no easy way to fix this problem.

But for a proper "dual boot" system you will have to install windows xp first as windows cannot see or access linux but linux can see and access windows. The reasoning behind this is that when linux installs itself the boot loader will be able to recognize that there is another O.S. and can include it in the "Menu" to boot from.

So install windows XP first with a minimum of 8000MB of disk space. Then install Linux(what ever flavor you are using) When asked for where to install choose the (remove and format linux partitions only) that way it will not bother the windows installation. Of course the disk space that you use will depend upon how you want to use it. You could use half of the hard drive space for one O.S. and the other half for the other. Example for a 160GB HDD you would specify for windows 80000MB for the partition size. If you aren't familar with Linux let Linux format the remaining space as it sees fit or choose the approprite size for the different partition sizes leaving the most for /home, /var, and /usr.
After all is installed it will boot to Linux's grub bootloader just hit the down arrow key to activate the "Hidden Menu" and see the windows path for booting into windows. Linux will list it as "Other System" in the menu.
You can change this by going into the grub.conf file in Linux and using your favorite text editor while logged in as root find the line that says. (Title = "Other System" and change just that to "Windows XP" that way when you boot and activate the boot menu you will see it listed as "Windows XP" instead of "Other System".
Remember the order is important Windows first then Linux. If you don't do it in this order you will never see Linux because windows will take over and never show it even if it is installed.
Remember Linux needs to have a driver built for the kernel if you are using Nvidia for video because it has to be built for each kernel. There are numerous sites devoted to dual booting just google "Dual Boot XP and Linux" to find a list and pick you favorite step by step walk through of the correct procedure.

Let us know how it goes.