Booted again with the install disk and used the reset password option and it worked. I think when I tried it before I didn't save it. Anyhow, done. Quite simple actually!
Now, what was it I was trying to achieve? Oh, yeah, something about file sharing between my Mac and 2 PCs.
Consensus is I forget IPv6. I think I'll delete the workgroup stuff on the Tosh, that just confused me and I'll start again. Somewhere.
Milo, thanks, note taken.
to log onto a shared drive on a windows PC from a Mac, the Mac needs to be logged in with a user name / password which also exists as a user on the PC, and the password cannot be blank . i.e. there HAS to be a password on the account