keyboard layout - Switch Alt and LWindows key in PC (Windows 7)

I have a Windows 7 keyboard that has Ctrl-LWindows-Alt bottom left. Can I switch LWindows-Alt layout to Alt-LWindows?

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Thanks for the answers!

I checked, downloaded the tools and tested very briefly. I must say that Will's answer is the best for me as I don't have to do anything but drag and drop. And as it just changes the registry, I expect no resource would be used. I remapped TAB and L-Windows key to Alt (meta) so that I can use Emacs with my PC like the one with my Mac.

Answer

I would use Remapkey.exe. It is available for free in the Windows Server 2003 Resource Kit.