I'm having problems with Snow Leopard and I wanted to reinstall the OS.. I have a Boot/Apps Drive and a Data drive. If I reinstall the operating system will I lose my applications? WIll I lose /Library/Application Supprort or /Library/Preferences?
It depends on what method you use to reinstall OSX. If you opt for a clean install, i.e., reformat. Then yes you'll lose your apps. If you choose archive and install then you should be safe. As ways make sure you have a good backup, just in case.