can you post the complete setup you have done?
Trying adding a new user account with a password to the Windows 7 machine. Or add a password to your existing account. I ran across this problem two days ago scanning from a 7120 to a Windows 7 machine. The xp machines don't require an account with a password but the Windows 7 machine did.
I cannot scan to "My Scans" folder in Windows 7. It works for my XP machine without issue. I have no idea what the problem is. I can print and login to the printer from all my Windows 7 machines but cannot Scan to file. Any ideas?