Kurt Lang wrote:
Boot to the Snow Leopard DVD and choose your main drive where 10.6.7 is installed. Click on the Options button to change the default install options. Such as turning on QuickTime 7 and Rosetta, which don't install by default. When you have your choices the way you want them, proceed with the install.
FWIW, at least if you follow the method described in the link & run the "Install Mac OS X" app instead of starting up directly from the DVD (& maybe even if you don't), the default options will automatically be set to what you probably want. For instance, if you have PowerPC apps installed that require Rosetta to run, the installer will notice this & install Rosetta by default. If you don't, it won't. Similarly, if you now have a Quicktime Pro license activated that unlocks the advanced editing features of Quicktime Player 7, a Snow Leopard compatible version of that app will be installed in the Utilities folder. Otherwise, it won't be installed, nor is there usually any reason to install it because without the Pro license it won't do anything Quicktime Player X (which is always installed anyway) won't do better.
The Snow Leopard installer also will look at the printer drivers currently installed & use that to decide what printer drivers to install, although you still may have to update them.