windows stores both the lm and ntlm hashes, because lm hashes are less secure you can turn them off if your not worried about compatability with older windows versions
go here:
Control Panel ->Administrative Tool -> Local Security Settings
->Local Policies -> Security Options
and change the values in "Network Security: do not store lan manager hash....." and "Network Security: lan manager authentication level
BTW northernsky
Quote
6 char. with numbers/letters usually works well enough
that can be brute forced in seconds