Try the following to see if it produces a useable result for you:
Right-click on the desktop, select New, and choose to create a new shortcut. Enter the shortcut target as follows: %windir%\explorer.exe /n /select,X: \TEST
where "X: \TEST" is the path to the folder you wish to open as default in Explorer (don't actually enter the space between : and \ -- I had to put this in here to prevent the board from substituting this smilie :\ ). Hit Next, then name and save the shortcut. Right-click on the shortcut to change any properties you wish, such as the shortcut icon or to open in full screen, then save the changes. Right-click on the shortcut, and you should now have the option available to pin it to the taskbar.
When you click on the pinned shortcut, it will open the target folder in an Explorer window. The first time you open it, format the display format to your liking (i.e. columns or icons, hide the preview plane, etc) and close the window. Using the shortcut again should open the folder like that in the future (at least, until you change it again or Windows develops amnesia, anyway).