As a default, you can set it like this:
Right click Windows explorer and select properties.Change, under the shortcut tab, the Target, to, for example, this %windir%\explorer.exe /e, /n, C:\
This page will give you info on these functions: Windows Explorer Command-Line Options
C: in my case, is my main HD with Windows 7 installed. The keys I have shown, open this at root, with the panes.
But, I think more to the point in your case, having done the above, you should select, in Windows explorer, Tools - Folder options, and then "Automatically expand to current folder".
It also occurs to me that, if you are still on the "learning curve" with 7, you may need the old bar menu: Again, select "Organise" -Layout, and you will see an option "Menu Bar"