[vbox-dev] Safe mode installation of D3D files.

[Jérôme Poulin]

I don't know if it has been talked before on the mailing list, but
there's no need to have to force installation in safe mode.
You can simply rename the following values while installing:
SourcePath
ServicePackSourcePath
in
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup\
and warn the user that Windows could pop-up a warning during
installation, to just cancel and accept and of course make sure
there's no Windows CD in the drive, but in the case of additions
installation, it should not happen.
You should also make sure the files do not appear in
%windir%\system32\dllcache and finally rename the files to replace and
select them for deletion on reboot. Put the new files and undo the
values renaming, reboot, all done!