I came across a problem when launching any PPC emulator through Visual Studio's Device Emulator Manager - I'd receive an error of the sort:
Failed to open XML parser COM object.
After digging around Google for a while I found the problem was related to a missing installation of MSXML Parser Version 3 (why MS are not using MSXML6 I do not know).
If you have the DLL on your PC the following command should solve the problem -:
regsvr32 %windir%\system32\msxml3.dllIf you're missing the DLL the parser can be downloaded from Microsoft.