1.Can I install to a location other then GOG Games on my C drive. I have a small C drive and a huge E drive because XP runs betters on a less crowded Drive.
2. Where is the Setup executable for the the games?
3. If i have to uninstall the game, how can I reinstall without another download ? I ask this before bothering to back up the games.

1. Yes, check the options on the installer.
2. Under "My Account" at the top of the page, it'll take you to the virtual shelf that lists all the games you've purchased and can then download.
3. Just save the install file that you downloaded from the site, and you can use that to reinstall at any time.

1: you set the destination path before the installation, it is on the button in lower left corner, IIRC.
2:what setup executable? If you are talking about graphics setup and such in an executable file, it should be in the game directory.
3:after you download the installer, don't delete it. Then you can reinstall the game without another download

Yes, you can specify any desired installation path during setup.
Wherever you chose to save it.
Just save the setup executable somewhere and reinstall from that whenever you want.
EDIT: Damn, double ninja'd.

1. You... Oh.