Since you have, or want to have, windoze on other than the first partition, I would make copies of any data you can not do without BEFORE trying to install windoze. It may be doable, but I have never did it. I can't say that I have ever seen or read of anybody else doing it with windoze on other than the first partition.
IF, note the if, it were me, I would install windoze on a empty drive and then install grub on the new drive and edit the fstab file for the drive changes. That would be safer because you can always fall back to something.
As it is now, when you boot that windoze CD to install, it will likely take the first partitions until it has enough space to install on. Remember, windoze can't read or generally recognize Linux partitions, especially off the install CD. It sees the partition but NOT what is on it.
I strongly suggest you have a backup of data before you go any further. There is a chance, in my opinion, that you will loose data.
My original thought was you windoze on it before and it just died and you wanted to put it back. That would put windoze on the first partition. That IS doable.
The old install rule, put on windoze first, then install Linux. Linux is rescueable, windoze is usually not. You lose windoze, it is dead. You loose Linux, you boot off a CD mount the partitions, chroot if needed, and fix it. I have done that a few times with Gentoo.
That's my two cents worth. Try if you want, but make sure you don't let windoze mess with your Linux partitions, which I am almost sure it will.
Any more questions???
