Administrative share in Windows 7 forcing domain access

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http://serverfault.com – With Windows XP, I used to access machines in the network (under a domain) via administrative share (hidden share, a.k.a. "C$"), authenticating myself as the local admin of each respective machine. Recently, the machines were upgraded to Windows 7. And now, when I try to access them via administrative share on Windows 7, it forces me to authenticate under the domain. Later I did some test with some Windows XP machines back again in the domain and it worked. So... is it possible to do it in Windows 7 as local admin, like I used to do in Windows XP? (I really hope there's a way...) (HowTos)