Thanks,Rick.hda2 was mounted on /home.Did deluser knoppix,then adduser knoppix.works ok.2 probs though.there is a strange line(when mount)(fstab is unchanged)
root@ed:/home/knoppix# mount
/dev/hda1 on / type reiserfs (rw)
/dev/root.old on /initrd type ext2 (rw).....this line!!!!!
none on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/hda4 on /mnt/hda4 type vfat (rw,nosuid,nodev,umask=000,uid=1000,gid=1000)
/dev/hda2 on /home type reiserfs (rw,nosuid,nodev)
root@ed:/home/knoppix#

and on desktop,there is this old root /.initrd mounted partition.The files in this seem to be same as in /.initrd.And when i open a new txt file,the font is strangely compressed(looks russian, R shows as P).