Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email email@example.com.
When you are installing Magento not have the Demo Store part added to it, and just say Magento, rather than Magento Demo Store, or at least Magento Installation. This is currently packed in 0.6.13160.zip not sure about the other.