ronintexas :
Do a custom install - in the advanced settings, it should allow you to choose where you want to install it.
Yeah, go slowly through the Windows that popup, it might not be obvious where the "choose custom install" option is. You might want to google "custom install for (programname)" as well.
It's possible to edit the registry as well to change the default install drive, which you might have too, it's not that hard, just google "Change default install drive in registry"