Failed to connect to SLD when first time logging in to SAP B1 client

Hi Everyone,

1. Server OS - Windows server 2008 - 64 bit
2. Server SAP Installations - 64 bit
3. Client OS - Windows XP 32 Bit
4. SAP Version - SAP 9 PL 11
5. Windows firewall disabled in server & client
6. Client system logged in as administrator user
7. No Antivirus softwares
8. In server SLD weblink is properly opening
9. SQL Native client properly installed
10. ODBC Connection for SQL Server is Properly working

with all the above conditions

In some Windows XP Client systems there is no problem

But in few system (in the same LAN - Pinging is pretty good) with Windows XP - when starting SAP B1 client for the first time after installation , it gives and error as "Failed to connect to System Landscape Directory",company list is empty

But in Browse option my server is listed out and can be chosen but still the error is there

I have tried uninstalling the client completely , deleting the folders from program files and registries cleaned and installed again from B1SHR folder of server

Still SLD Not connecting

Help me in this problem.....