SAP LOGON error

Dear Sir,

I install SAP Enhancement Package 4 for SAP 6.0 successfully in windows 2003 R2 server. with <work group> mode . and I have small LAN where i can access all my network computer.

I want to access the SAP systems . I installed (another computer with XP platform ) SAP front end 7.10.

Now I can not access the SAP systems.. error showing. please help me to access the sap systems.