I know this does not fully relate to your windows explorer replacement question, but I think this might help you since you like the look and way of xp better then 7.
Making 7 look and act more like XP:
Windows Explorer:
Click start

rb: type folder options. Click the top result. In the folder options window, choose the view tab.
Choose the following options:
-Checkmark Always show menus
-Uncheck hide empty drives in the computer folder
-Uncheck Hide extensions for known file types
Click apply, then click the general tab. Under navigation pane, check show all folders and automatically expand to current folder.
Click ok.
Taskbar:
Right click the taskbar on a blank area. Choose properties. Under taskbar, choose use small icons. Under taskbar buttons, choose never combine. Click ok.
Bring quick launch back to windows 7:
Guided Help: Enable the Quick Launch bar in Windows 7
There are other ways to customize your pc. See here:
Personalizing your computer - Microsoft Windows Help
Also read up on the help and support option in the start menu. It is actually quite good now and is great to get more information on windows 7 and all the new features. You can also read up on
UAC and how it protects your pc.
You may also be interested in this:
(This option will cause a slight drop in performance-results may vary)
http://www.sevenforums.com/tutorials/77626-convert-windows-xp-style.html