hashdump problems

[<stevekg () cox net>]

When we execute the Meterpreter script "run hashdump" on a compromised Windows XP and on  a Windows 7.  The HASH 
results are different even though the same account (e.g. local Administrator) has the same password.  For example, the 
password "pass-w0rd" will have the following values on Windows XP:
a824903ef6ab871802657a8d8ef025e2:fac374e2461f3e432 cd4c560dd183671
which can be easily cracked using the Rainbow table.  However, the hash value returned from the Windows 7 seem random 
on different Win 7 systems, for example, the following hash value is returned from running the "run hashdump" script on 
one of our Win 7 system and can no longer be cracked by the Rainbow table even though it is the same password:
be7248be0caf22327a7798efba346fb7:1a9d81b177c19a206 5eaee8cbe9689ce

My question is, does Win 7 system encrypt the hash so "run hashdum" can not return the correct value as the one on the 
Win XP system?
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