File Sharing problem

I have two identical computers (Dell Studio 1555 -names: "HOME-Dell1" and "HOME-Dell2") running Windows 7 RC 7100 in a workgroup called "HOME". Both computers have only 1 user: "System Administrator" with the same password. In the sharing setting they have ON the password protected sharing. The Windows Firewall in both computers have rules to allow sharing files and printers

This is the background and the problem is when I try to access to C$ from Dell2 to Dell1 it ask me for password one time and again and again. I'm sure that I'm writing correctly the data but it ask me again and again. When I access from Dell1 to Dell2 it connects very perfectly (C$) and even never ask me for enter user and password.

I don't know what to do, please help me...

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