Blender's home folder (.blender)

I’ve recently reinstalled my operating system (upped to win7) and I need to change where Blender looks for the .blender folder.

Currently it’s somewhere like:
C:\Users\Valentine\AppData\Roaming\Blender Foundation\Blender.blender\

My backup from the previous install is at:

How do I tell blender to ignore the new one on the C: drive and use the D: one?

I’ve tried updating the registry, to no apparent effect.

This is really annoying, anyone know what I’ve missed here?

@Dr. Valentine

How about doing a reinstall? If you are concerned about your customized settings, you can make a backup of .B.blend in the .blender folder.