I had to update my GPO and also restart the server but removing the [microsoft network client enforced secured communications] option, I was able to access my samba shares again. Thank you very much.
Unfortunately I keep having the same error with Windows 7 Professional 32 bit while trying to access a Samba 2.2.x share even after the last setting about "Microsoft network client: Digitally sign communications (always)" and reboot. I map the directory but can't access to it.
Anyone has any other idea?
Thanks.