By default, Windows 7 is pretty locked down. One issue is that administrators are used to being able to connect to a system just by typing \\NameOfComputer\C$. This does not inherently work in Windows 7. In order to be able to do this with the new OS, you are going to have to make so changes to the registry.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System in the registry. Create a REG_DWORD value called LocalAccountTokenPolicy and set the value to 1. This will allow you to connect directly to the C driver.
In addition, if you want to set this up as a post install task you can add this line to a BAT Script Item.
REG.EXE Add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v LocalAccountTokenPolicy /t REG_DWORD /d 1 /f