Janusz,
This is the man page for grml2hd. If you are not exhausted and disenchanted by the effort please give it a read. http://grml.org/grml2hd/grml2hd.html
It gives GRML2HD_NONINTERACTIVE=1 grml2hd partition=/dev/sdsa5 mbr=/dev/sda5 filesystem=ext3 user=janusz
(the last goes all on one line) Debian will still ask for your real name to personalise some things. The file to edit is /etc/grml/config - - -
If you do manage to install OK then make a grub floppy. As root do grub - which gives you a grub prompt
grub> root (hd04)
Which is grub talk for sda5. Then put a formatted floppy in the drive and do
grub> setup (fd0)
This floppy will boot straight into your installed system. Then to boot XP you only have to take the floppy out and it boots as normal.
Best Wishes Moss