After recently installing Windows 7, I found that I was unable to access the “default admin shares” for my local drives, namely \\ME\C$. I was able to see the machine on my local network, so I know that the firewall wasn’t the problem. If I shared out something explicitly, I could see that from other machines as well: File Sharing was turned on. On other networks, I know that I’ve been able to access the C$ share from other machines, so the functionality was still there, but likely just turned off.
From HowToGeek.com, I found a registry setting that would allow this. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System, add a new DWORD called LocalAccountTokenFilterPolicy and set its value to 1 and reboot. Want to revert? Delete the key or set it 0.
I must have done this for Vista as well, but I don’t remember doing it… either way, it works. And this was the “last” box. All of my machines are Windows 7 64-bit including VM’s and Bootcamp partitions. My Lenovo S10 had to settle for the 32-bit version of Windows 7 because Atom didn’t like the x64 version. The only other OS I see daily is from a couple of servers which are Windows 2008 (and awaiting an R2 installation).
And so Vista slips away …as XP, 2000, NT, 98, 95, and 3.11 did before it.