I don't know what a "logical" partition is.

1. Boot to Linux, and mount a floppy (I think the floppy has to be formatted as FAT32; Windows needs to be able to read it later). Type <b>dd if=/dev/hda1 bs=512 count=1 of=/mnt/floppy/enigma.bin</b> . hda1 should be the boot partition of your Linux drive, I THINK. I'm not sure. I usually have to try a couple times to get the right dev . Name enigma.bin whatever you want. The tutorial I found named it that because it was the codename for RH 7.2, or something. Make sure you check the floppy to see that a file was actually created. A lot of times it'd fail for me and create a file that was 0 KB. It ought to be 512 KB.
2. In XP, copy the enigma.bin to c:\enigma.bin
3. You need to edit boot.ini in XP to add <b>c:\enigma.bin="Linux"</b>. Then it ought to work. If it doesn't, you probably need to do that dd command again.