Option 1 (with 7-ZIP)

1. Go to Google Earth download website and click on "Customise your installation with advanced setup"
   
2. Download latest version .exe file
3. Extract .exe with 7-ZipPortable
   
4. Copy following files and folders:
   LocalAppData
   program files
   1033.mst (English language)
   Google Earth.msi
   Setup.ini
5. Open Google Earth.msi with MS Orca msi editor
6. View > Summary Information > Languages - delete everything except 1033 (English)
7. Save changes
8. Deploy using GP as any other .msi packet.
   

Option 2 (Without 7-ZIP)

1. Go to Google Earth download website and click on "Customise your installation with advanced setup"
2. Download latest version .exe file
3. Run .exe installation file (do not proceed with installation).
4. .msi and other installation files will be extracted to "C:\Documents and Settings\username\Local Settings\Temp\7ZipSfx.000" (on Windows XP)
   To find exact location you can use Filemon with "*.msi" filter before running .exe
5. Copy following files and folders:
   LocalAppData
   program files
   1033.mst (English language)
   Google Earth.msi
   Setup.ini
6. Open Google Earth.msi with MS Orca msi editor
7. View > Summary Information > Languages - delete everything except 1033 (English)
8. Save changes
   
9. Deploy using GP as any other .msi packet.
   

If in Step 1 for any reason you can't download advanced setup file (which is full Google Earth .exe):
Download standard "Google Updater".
When "Google Updater" runs it downloads Google Earth .exe file to "C:\Program Files\Google\Update\Download". Be aware that Google Updater may start installation automatically without any warnings.

Google Earth 5
Google Earth 6