Most people start the Windows-Explorer by clicking on a shortcut to the Windows-Explorer program. Noramlly the Windows-Explorer starts in the "My Documents" Directory. If you want Windows-Explorer to start in a different Directory, just follow the steps below:
1) Right-Click the shortcut to the Windows-Explorer
2) Choose "Properties"
3) On the "Shortcut" Tab, you see something like:
(without the quotes).
4) You have to change this into:
"%SystemRoot%\explorer.exe /n, /e, D:\"
(without quotes). Instead of "D:\" you can choose any path you like. In the example above, windows-explorer will start in "D:\".
Goog Luck, and happy tweaking ya'll..