[Samba] Windows 7 and samba 3.0.28

[vishesh kumar]

Dear all
 May be this question asked earlier in list but i didn't able to search
exact . I have samba+ldap domain setup on RHEL 5.1 and samba version is
3.0.28. Today i got a windows 7 system , but i am not able to join that
system in our samba+ldap domain. Do i need to do any registry tweaking. I
can't upgrade own samba version beyond 3.0.33 because this maximum version i
get if i update my system to RHEL 5.5.

Thanks