Windows is on a logical partition unless you have it on a separate drive. leave the boot order alone. You can comment it out.
Until recently, I have by choice dual-booted several WinXP-Linux OS:s by changing the boot order in the BIOS (to avoid messing up Win, boot loaders and distros).
However, three Ubuntu 8.10 and related distros all "freeze" at "(initramfs)", while WinXP boots normally. From memory no earlier versions of Ubuntu, Mint, and Kubuntu had this problem. Any way short of disconnecting the WinXP drive to avoid this problem?