uninstalling CFS2!

Hello everyone. I posted a question a week ago about oposition planes not droping their load on runways. Where I received very little respond. Now I want to completly uninstall CF2 and install it again. However I do not want to lose Mask Rider runways and scenary. (or anything else that is associated with proper showing of their runways and scenery)
Could you guide me with proper unistall and install steps, including nessecery backups, please.
Thanks;
Vilik
Could you guide me with proper unistall and install steps, including nessecery backups, please.
Thanks;
Vilik