[Samba] Connecxions problems

[De Leeuw Guy]

Hi all,

I run samba 3.0.9 under RHAS 3

I have about 20 stations with xp and all work fine. Except 2 stations : 
I cannot logon this 2 systems to the Samba workgroup.
 From a linux workstation, I can connect and browse the share (in 
konqueror "smb://Samba/user")
EnablePlainTextPassword = 1
requiresignorseal = 0

Any suggestions are welcome

Thanks in advance
Guy