Best way to crack NT passwds

[X u r r o n <xurron () gmail com>]

hiya!
I have tried many softwares for cracking NTLM hashes, like NC4, Cain and 
have't tried Rainbow Crack yet.
Once i had to recover my XPs lost admin password and i spend around 1 day 
but Cain/NC4 were not able to guess that. Then i posted that hashes on some 
site and it did recover my passwd in around 5min. I want to know which 
technique they used to crack so fast ?

Xurron

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