Re-installed OSX asking for very old password

I just re-installed OSX 10.2 on my emac, saved the user profiles and other stuff as suggested but now the OS is asking for a password I haven't used in 5 or more years. Already check caps and num locks. Is there a way around this? --bjbosche

System now logs into Darwin

I needed to restore my original OS due to boot issues.
After restoring using the original OS and saving the user data I found none of my passwords worked.
I used the OS CD to reset all passwords and now after logging in I go straight to darwin.
Booting to single user mode and running /sbin/fsck -y gives a "volume is journaled. No checking performed" using the -f option checks the disk however I've done this at least 6 times with the same result.....
Invalid leaf record count
(It should be 27 instead of 810)
Checking volume bit map
checking volume information
repairing volume

File system was modified

If I immediately re-run the fsck I get the same result.
If I reboot to single user and run fsck I get the same result.

Please help