You installed WoW to "d:\bin\World of Warcraft" or you want to create a new copy there? Either way, that's not what I would reccomend. The script should find your normal WoW install location from the envirnmoent variables. (It could be smarter about this.) If it fails for some reason you can specify it manually via the -sourcePath param:

Code:
new-wow d:\wow1 -sourcePath "c:\program files\world of warcraft"
Also, there's no reason to put new copies of WoW under d:\bin. If you want to I guess you can, but it's not a requirement.