Hello,
@yancek,
post #15: There is only one entry for sda1 in /etc/fstab, see listing in
post #1.
Replacing "root (hd0,0)" by "rootnoverify (hd0,0)" in /boot/menu.lst (after backing up the original file), rebooting and chosing "Windows" in the GRUB menu yields
Code:
Booting 'Windows 95/98/NT/2000'
rootnoverify (hd0,0)
makeactive
chainloader +1
after which the machine halts.