If you post the code you are using, I can probably help.
On another note, why are you "returning" the password? Passwords are stored as hashes in the SAM, and I imagine, you are not looking for the hash. So, are you just looking for a succes or fail?

update:
But, just to do a little assuming, here is a code snippet. This uses Roth's Win32::AdminMisc module (and the code is obtained from the site). 
if( Win32::AdminMisc::UserCheckPassword("", $User, $Password)){
    print "Password is correct.\n";
}else{
    print "Password is not correct.\n";
}

[download]
Jeremy

In reply to Re: Using Win32::NetAdmin for passwords by enoch
in thread Using Win32::NetAdmin for passwords by kbradford

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