Hi,
since Windows Vista the access from network for members of the local Administrators group is restricted by default.
This affects the Adminshares C$,.., Registry and much more. For example
c:\> net use \\yourComputer.yourdnsdomain.org\c$ /user:yourComputer.yourdnsdomain.org\localadministrator
Type the password for \\yourComputer.yourdnsdomain.org\c$:
System error 5 has occurred.
Access is denied.
UAC blocks such connections by default expect your Computer is member of a domain.
If you want to get set back the oldstyle behaviour disable the Local Account Token filter by setting LocalAccountTokenFilterPolicy to 1.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
"LocalAccountTokenFilterPolicy"=dword:00000001
or from command line
c:\> reg add HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v LocalAccountTokenFilterPolicy /t REG_DWORD /d 1 /f
Michael