Easiest way is not to mess with the Start Menu. Right click the Windows Explorer entry on
the Start menu/Programs/Accessories/Windows Explorer, left click Send To:/Desktop (create
shortcut). When the short cut for Windows Explorer is on your desktop right click it,
left click Properties, and on the Target line replace what's there with:
%SystemRoot%\explorer.exe /n,/e,C:\
Then when you double click that shortcut Windows Explorer will open to the C drive with
its folders expanded. If you want access to that when another program or other programs
are open, and it isn't convenient to get to your desktop: Right click an empty area on
your taskbar, left click Toolbars/Desktop. That will put: Desktop >> just to the left of
your Notification Area (formerly System Tray). When you left click on the >> a menu will
open with all of the shortcuts that are on your desktop, and you can click on Windows
Explorer from there to access the contents of your C drive.