There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section. Before you post please read this
Nope, when you run the install for Mint 6, choose manual partitioning and choose to format the root partition. This will install Mint 6 Just like Mint 5 was, and you will still be able to access windows. Just don't overwrite anything that says NTFS.
Linux Mint 8 RC1 = Nice 'apt install' can be used on Linux Mint as a shortcut for 'sudo apt-get install'. 'apt x' can be used for various other apt commands as well. When a problem is solved, please add [SOLVED] to your thread title.